7244 lines
187 KiB
C
7244 lines
187 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||
|
||
/***
|
||
This file is part of systemd.
|
||
|
||
Copyright 2010 Lennart Poettering
|
||
|
||
systemd is free software; you can redistribute it and/or modify it
|
||
under the terms of the GNU Lesser General Public License as published by
|
||
the Free Software Foundation; either version 2.1 of the License, or
|
||
(at your option) any later version.
|
||
|
||
systemd is distributed in the hope that it will be useful, but
|
||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public License
|
||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||
***/
|
||
|
||
#include <assert.h>
|
||
#include <string.h>
|
||
#include <unistd.h>
|
||
#include <errno.h>
|
||
#include <stdlib.h>
|
||
#include <signal.h>
|
||
#include <stdio.h>
|
||
#include <syslog.h>
|
||
#include <sched.h>
|
||
#include <sys/resource.h>
|
||
#include <linux/sched.h>
|
||
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <fcntl.h>
|
||
#include <dirent.h>
|
||
#include <sys/ioctl.h>
|
||
#include <linux/vt.h>
|
||
#include <linux/tiocl.h>
|
||
#include <termios.h>
|
||
#include <stdarg.h>
|
||
#include <sys/inotify.h>
|
||
#include <sys/poll.h>
|
||
#include <ctype.h>
|
||
#include <sys/prctl.h>
|
||
#include <sys/utsname.h>
|
||
#include <pwd.h>
|
||
#include <netinet/ip.h>
|
||
#include <linux/kd.h>
|
||
#include <dlfcn.h>
|
||
#include <sys/wait.h>
|
||
#include <sys/time.h>
|
||
#include <glob.h>
|
||
#include <grp.h>
|
||
#include <sys/mman.h>
|
||
#include <sys/vfs.h>
|
||
#include <sys/mount.h>
|
||
#include <linux/magic.h>
|
||
#include <limits.h>
|
||
#include <langinfo.h>
|
||
#include <locale.h>
|
||
#include <sys/personality.h>
|
||
#include <libgen.h>
|
||
#undef basename
|
||
|
||
#ifdef HAVE_SYS_AUXV_H
|
||
#include <sys/auxv.h>
|
||
#endif
|
||
|
||
#include "macro.h"
|
||
#include "util.h"
|
||
#include "ioprio.h"
|
||
#include "missing.h"
|
||
#include "log.h"
|
||
#include "strv.h"
|
||
#include "label.h"
|
||
#include "mkdir.h"
|
||
#include "path-util.h"
|
||
#include "exit-status.h"
|
||
#include "hashmap.h"
|
||
#include "env-util.h"
|
||
#include "fileio.h"
|
||
#include "device-nodes.h"
|
||
#include "utf8.h"
|
||
#include "gunicode.h"
|
||
#include "virt.h"
|
||
#include "def.h"
|
||
|
||
int saved_argc = 0;
|
||
char **saved_argv = NULL;
|
||
|
||
static volatile unsigned cached_columns = 0;
|
||
static volatile unsigned cached_lines = 0;
|
||
|
||
size_t page_size(void) {
|
||
static thread_local size_t pgsz = 0;
|
||
long r;
|
||
|
||
if (_likely_(pgsz > 0))
|
||
return pgsz;
|
||
|
||
r = sysconf(_SC_PAGESIZE);
|
||
assert(r > 0);
|
||
|
||
pgsz = (size_t) r;
|
||
return pgsz;
|
||
}
|
||
|
||
bool streq_ptr(const char *a, const char *b) {
|
||
|
||
/* Like streq(), but tries to make sense of NULL pointers */
|
||
|
||
if (a && b)
|
||
return streq(a, b);
|
||
|
||
if (!a && !b)
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
char* endswith(const char *s, const char *postfix) {
|
||
size_t sl, pl;
|
||
|
||
assert(s);
|
||
assert(postfix);
|
||
|
||
sl = strlen(s);
|
||
pl = strlen(postfix);
|
||
|
||
if (pl == 0)
|
||
return (char*) s + sl;
|
||
|
||
if (sl < pl)
|
||
return NULL;
|
||
|
||
if (memcmp(s + sl - pl, postfix, pl) != 0)
|
||
return NULL;
|
||
|
||
return (char*) s + sl - pl;
|
||
}
|
||
|
||
char* first_word(const char *s, const char *word) {
|
||
size_t sl, wl;
|
||
const char *p;
|
||
|
||
assert(s);
|
||
assert(word);
|
||
|
||
/* Checks if the string starts with the specified word, either
|
||
* followed by NUL or by whitespace. Returns a pointer to the
|
||
* NUL or the first character after the whitespace. */
|
||
|
||
sl = strlen(s);
|
||
wl = strlen(word);
|
||
|
||
if (sl < wl)
|
||
return NULL;
|
||
|
||
if (wl == 0)
|
||
return (char*) s;
|
||
|
||
if (memcmp(s, word, wl) != 0)
|
||
return NULL;
|
||
|
||
p = s + wl;
|
||
if (*p == 0)
|
||
return (char*) p;
|
||
|
||
if (!strchr(WHITESPACE, *p))
|
||
return NULL;
|
||
|
||
p += strspn(p, WHITESPACE);
|
||
return (char*) p;
|
||
}
|
||
|
||
int close_nointr(int fd) {
|
||
assert(fd >= 0);
|
||
|
||
if (close(fd) >= 0)
|
||
return 0;
|
||
|
||
/*
|
||
* Just ignore EINTR; a retry loop is the wrong thing to do on
|
||
* Linux.
|
||
*
|
||
* http://lkml.indiana.edu/hypermail/linux/kernel/0509.1/0877.html
|
||
* https://bugzilla.gnome.org/show_bug.cgi?id=682819
|
||
* http://utcc.utoronto.ca/~cks/space/blog/unix/CloseEINTR
|
||
* https://sites.google.com/site/michaelsafyan/software-engineering/checkforeintrwheninvokingclosethinkagain
|
||
*/
|
||
if (errno == EINTR)
|
||
return 0;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
int safe_close(int fd) {
|
||
|
||
/*
|
||
* Like close_nointr() but cannot fail. Guarantees errno is
|
||
* unchanged. Is a NOP with negative fds passed, and returns
|
||
* -1, so that it can be used in this syntax:
|
||
*
|
||
* fd = safe_close(fd);
|
||
*/
|
||
|
||
if (fd >= 0) {
|
||
PROTECT_ERRNO;
|
||
|
||
/* The kernel might return pretty much any error code
|
||
* via close(), but the fd will be closed anyway. The
|
||
* only condition we want to check for here is whether
|
||
* the fd was invalid at all... */
|
||
|
||
assert_se(close_nointr(fd) != -EBADF);
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
void close_many(const int fds[], unsigned n_fd) {
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||
unsigned i;
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||
|
||
assert(fds || n_fd <= 0);
|
||
|
||
for (i = 0; i < n_fd; i++)
|
||
safe_close(fds[i]);
|
||
}
|
||
|
||
int unlink_noerrno(const char *path) {
|
||
PROTECT_ERRNO;
|
||
int r;
|
||
|
||
r = unlink(path);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int parse_boolean(const char *v) {
|
||
assert(v);
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||
|
||
if (streq(v, "1") || strcaseeq(v, "yes") || strcaseeq(v, "y") || strcaseeq(v, "true") || strcaseeq(v, "t") || strcaseeq(v, "on"))
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||
return 1;
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||
else if (streq(v, "0") || strcaseeq(v, "no") || strcaseeq(v, "n") || strcaseeq(v, "false") || strcaseeq(v, "f") || strcaseeq(v, "off"))
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||
return 0;
|
||
|
||
return -EINVAL;
|
||
}
|
||
|
||
int parse_pid(const char *s, pid_t* ret_pid) {
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||
unsigned long ul = 0;
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||
pid_t pid;
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||
int r;
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||
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||
assert(s);
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||
assert(ret_pid);
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||
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||
r = safe_atolu(s, &ul);
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||
if (r < 0)
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||
return r;
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||
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||
pid = (pid_t) ul;
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||
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||
if ((unsigned long) pid != ul)
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||
return -ERANGE;
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||
|
||
if (pid <= 0)
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||
return -ERANGE;
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||
|
||
*ret_pid = pid;
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||
return 0;
|
||
}
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||
|
||
int parse_uid(const char *s, uid_t* ret_uid) {
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||
unsigned long ul = 0;
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||
uid_t uid;
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||
int r;
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||
|
||
assert(s);
|
||
assert(ret_uid);
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||
|
||
r = safe_atolu(s, &ul);
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||
if (r < 0)
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||
return r;
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||
|
||
uid = (uid_t) ul;
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||
|
||
if ((unsigned long) uid != ul)
|
||
return -ERANGE;
|
||
|
||
/* Some libc APIs use (uid_t) -1 as special placeholder */
|
||
if (uid == (uid_t) 0xFFFFFFFF)
|
||
return -ENXIO;
|
||
|
||
/* A long time ago UIDs where 16bit, hence explicitly avoid the 16bit -1 too */
|
||
if (uid == (uid_t) 0xFFFF)
|
||
return -ENXIO;
|
||
|
||
*ret_uid = uid;
|
||
return 0;
|
||
}
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||
|
||
int safe_atou(const char *s, unsigned *ret_u) {
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||
char *x = NULL;
|
||
unsigned long l;
|
||
|
||
assert(s);
|
||
assert(ret_u);
|
||
|
||
errno = 0;
|
||
l = strtoul(s, &x, 0);
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||
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||
if (!x || x == s || *x || errno)
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||
return errno > 0 ? -errno : -EINVAL;
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||
|
||
if ((unsigned long) (unsigned) l != l)
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||
return -ERANGE;
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||
|
||
*ret_u = (unsigned) l;
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||
return 0;
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||
}
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||
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||
int safe_atoi(const char *s, int *ret_i) {
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||
char *x = NULL;
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||
long l;
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||
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||
assert(s);
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||
assert(ret_i);
|
||
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||
errno = 0;
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||
l = strtol(s, &x, 0);
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||
|
||
if (!x || x == s || *x || errno)
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||
return errno > 0 ? -errno : -EINVAL;
|
||
|
||
if ((long) (int) l != l)
|
||
return -ERANGE;
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||
|
||
*ret_i = (int) l;
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||
return 0;
|
||
}
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||
|
||
int safe_atou8(const char *s, uint8_t *ret) {
|
||
char *x = NULL;
|
||
unsigned long l;
|
||
|
||
assert(s);
|
||
assert(ret);
|
||
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||
errno = 0;
|
||
l = strtoul(s, &x, 0);
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||
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||
if (!x || x == s || *x || errno)
|
||
return errno > 0 ? -errno : -EINVAL;
|
||
|
||
if ((unsigned long) (uint8_t) l != l)
|
||
return -ERANGE;
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||
|
||
*ret = (uint8_t) l;
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||
return 0;
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||
}
|
||
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||
int safe_atollu(const char *s, long long unsigned *ret_llu) {
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||
char *x = NULL;
|
||
unsigned long long l;
|
||
|
||
assert(s);
|
||
assert(ret_llu);
|
||
|
||
errno = 0;
|
||
l = strtoull(s, &x, 0);
|
||
|
||
if (!x || x == s || *x || errno)
|
||
return errno ? -errno : -EINVAL;
|
||
|
||
*ret_llu = l;
|
||
return 0;
|
||
}
|
||
|
||
int safe_atolli(const char *s, long long int *ret_lli) {
|
||
char *x = NULL;
|
||
long long l;
|
||
|
||
assert(s);
|
||
assert(ret_lli);
|
||
|
||
errno = 0;
|
||
l = strtoll(s, &x, 0);
|
||
|
||
if (!x || x == s || *x || errno)
|
||
return errno ? -errno : -EINVAL;
|
||
|
||
*ret_lli = l;
|
||
return 0;
|
||
}
|
||
|
||
int safe_atod(const char *s, double *ret_d) {
|
||
char *x = NULL;
|
||
double d = 0;
|
||
|
||
assert(s);
|
||
assert(ret_d);
|
||
|
||
RUN_WITH_LOCALE(LC_NUMERIC_MASK, "C") {
|
||
errno = 0;
|
||
d = strtod(s, &x);
|
||
}
|
||
|
||
if (!x || x == s || *x || errno)
|
||
return errno ? -errno : -EINVAL;
|
||
|
||
*ret_d = (double) d;
|
||
return 0;
|
||
}
|
||
|
||
static size_t strcspn_escaped(const char *s, const char *reject) {
|
||
bool escaped = false;
|
||
size_t n;
|
||
|
||
for (n=0; s[n]; n++) {
|
||
if (escaped)
|
||
escaped = false;
|
||
else if (s[n] == '\\')
|
||
escaped = true;
|
||
else if (strchr(reject, s[n]))
|
||
break;
|
||
}
|
||
/* if s ends in \, return index of previous char */
|
||
return n - escaped;
|
||
}
|
||
|
||
/* Split a string into words. */
|
||
const char* split(const char **state, size_t *l, const char *separator, bool quoted) {
|
||
const char *current;
|
||
|
||
current = *state;
|
||
|
||
if (!*current) {
|
||
assert(**state == '\0');
|
||
return NULL;
|
||
}
|
||
|
||
current += strspn(current, separator);
|
||
if (!*current) {
|
||
*state = current;
|
||
return NULL;
|
||
}
|
||
|
||
if (quoted && strchr("\'\"", *current)) {
|
||
char quotechars[2] = {*current, '\0'};
|
||
|
||
*l = strcspn_escaped(current + 1, quotechars);
|
||
if (current[*l + 1] == '\0' ||
|
||
(current[*l + 2] && !strchr(separator, current[*l + 2]))) {
|
||
/* right quote missing or garbage at the end*/
|
||
*state = current;
|
||
return NULL;
|
||
}
|
||
assert(current[*l + 1] == quotechars[0]);
|
||
*state = current++ + *l + 2;
|
||
} else if (quoted) {
|
||
*l = strcspn_escaped(current, separator);
|
||
*state = current + *l;
|
||
} else {
|
||
*l = strcspn(current, separator);
|
||
*state = current + *l;
|
||
}
|
||
|
||
return current;
|
||
}
|
||
|
||
int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
|
||
int r;
|
||
_cleanup_free_ char *line = NULL;
|
||
long unsigned ppid;
|
||
const char *p;
|
||
|
||
assert(pid >= 0);
|
||
assert(_ppid);
|
||
|
||
if (pid == 0) {
|
||
*_ppid = getppid();
|
||
return 0;
|
||
}
|
||
|
||
p = procfs_file_alloca(pid, "stat");
|
||
r = read_one_line_file(p, &line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
/* Let's skip the pid and comm fields. The latter is enclosed
|
||
* in () but does not escape any () in its value, so let's
|
||
* skip over it manually */
|
||
|
||
p = strrchr(line, ')');
|
||
if (!p)
|
||
return -EIO;
|
||
|
||
p++;
|
||
|
||
if (sscanf(p, " "
|
||
"%*c " /* state */
|
||
"%lu ", /* ppid */
|
||
&ppid) != 1)
|
||
return -EIO;
|
||
|
||
if ((long unsigned) (pid_t) ppid != ppid)
|
||
return -ERANGE;
|
||
|
||
*_ppid = (pid_t) ppid;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_starttime_of_pid(pid_t pid, unsigned long long *st) {
|
||
int r;
|
||
_cleanup_free_ char *line = NULL;
|
||
const char *p;
|
||
|
||
assert(pid >= 0);
|
||
assert(st);
|
||
|
||
p = procfs_file_alloca(pid, "stat");
|
||
r = read_one_line_file(p, &line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
/* Let's skip the pid and comm fields. The latter is enclosed
|
||
* in () but does not escape any () in its value, so let's
|
||
* skip over it manually */
|
||
|
||
p = strrchr(line, ')');
|
||
if (!p)
|
||
return -EIO;
|
||
|
||
p++;
|
||
|
||
if (sscanf(p, " "
|
||
"%*c " /* state */
|
||
"%*d " /* ppid */
|
||
"%*d " /* pgrp */
|
||
"%*d " /* session */
|
||
"%*d " /* tty_nr */
|
||
"%*d " /* tpgid */
|
||
"%*u " /* flags */
|
||
"%*u " /* minflt */
|
||
"%*u " /* cminflt */
|
||
"%*u " /* majflt */
|
||
"%*u " /* cmajflt */
|
||
"%*u " /* utime */
|
||
"%*u " /* stime */
|
||
"%*d " /* cutime */
|
||
"%*d " /* cstime */
|
||
"%*d " /* priority */
|
||
"%*d " /* nice */
|
||
"%*d " /* num_threads */
|
||
"%*d " /* itrealvalue */
|
||
"%llu " /* starttime */,
|
||
st) != 1)
|
||
return -EIO;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fchmod_umask(int fd, mode_t m) {
|
||
mode_t u;
|
||
int r;
|
||
|
||
u = umask(0777);
|
||
r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
|
||
umask(u);
|
||
|
||
return r;
|
||
}
|
||
|
||
char *truncate_nl(char *s) {
|
||
assert(s);
|
||
|
||
s[strcspn(s, NEWLINE)] = 0;
|
||
return s;
|
||
}
|
||
|
||
int get_process_state(pid_t pid) {
|
||
const char *p;
|
||
char state;
|
||
int r;
|
||
_cleanup_free_ char *line = NULL;
|
||
|
||
assert(pid >= 0);
|
||
|
||
p = procfs_file_alloca(pid, "stat");
|
||
r = read_one_line_file(p, &line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
p = strrchr(line, ')');
|
||
if (!p)
|
||
return -EIO;
|
||
|
||
p++;
|
||
|
||
if (sscanf(p, " %c", &state) != 1)
|
||
return -EIO;
|
||
|
||
return (unsigned char) state;
|
||
}
|
||
|
||
int get_process_comm(pid_t pid, char **name) {
|
||
const char *p;
|
||
int r;
|
||
|
||
assert(name);
|
||
assert(pid >= 0);
|
||
|
||
p = procfs_file_alloca(pid, "comm");
|
||
|
||
r = read_one_line_file(p, name);
|
||
if (r == -ENOENT)
|
||
return -ESRCH;
|
||
|
||
return r;
|
||
}
|
||
|
||
int get_process_cmdline(pid_t pid, size_t max_length, bool comm_fallback, char **line) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
char *r = NULL, *k;
|
||
const char *p;
|
||
int c;
|
||
|
||
assert(line);
|
||
assert(pid >= 0);
|
||
|
||
p = procfs_file_alloca(pid, "cmdline");
|
||
|
||
f = fopen(p, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
if (max_length == 0) {
|
||
size_t len = 0, allocated = 0;
|
||
|
||
while ((c = getc(f)) != EOF) {
|
||
|
||
if (!GREEDY_REALLOC(r, allocated, len+2)) {
|
||
free(r);
|
||
return -ENOMEM;
|
||
}
|
||
|
||
r[len++] = isprint(c) ? c : ' ';
|
||
}
|
||
|
||
if (len > 0)
|
||
r[len-1] = 0;
|
||
|
||
} else {
|
||
bool space = false;
|
||
size_t left;
|
||
|
||
r = new(char, max_length);
|
||
if (!r)
|
||
return -ENOMEM;
|
||
|
||
k = r;
|
||
left = max_length;
|
||
while ((c = getc(f)) != EOF) {
|
||
|
||
if (isprint(c)) {
|
||
if (space) {
|
||
if (left <= 4)
|
||
break;
|
||
|
||
*(k++) = ' ';
|
||
left--;
|
||
space = false;
|
||
}
|
||
|
||
if (left <= 4)
|
||
break;
|
||
|
||
*(k++) = (char) c;
|
||
left--;
|
||
} else
|
||
space = true;
|
||
}
|
||
|
||
if (left <= 4) {
|
||
size_t n = MIN(left-1, 3U);
|
||
memcpy(k, "...", n);
|
||
k[n] = 0;
|
||
} else
|
||
*k = 0;
|
||
}
|
||
|
||
/* Kernel threads have no argv[] */
|
||
if (r == NULL || r[0] == 0) {
|
||
_cleanup_free_ char *t = NULL;
|
||
int h;
|
||
|
||
free(r);
|
||
|
||
if (!comm_fallback)
|
||
return -ENOENT;
|
||
|
||
h = get_process_comm(pid, &t);
|
||
if (h < 0)
|
||
return h;
|
||
|
||
r = strjoin("[", t, "]", NULL);
|
||
if (!r)
|
||
return -ENOMEM;
|
||
}
|
||
|
||
*line = r;
|
||
return 0;
|
||
}
|
||
|
||
int is_kernel_thread(pid_t pid) {
|
||
const char *p;
|
||
size_t count;
|
||
char c;
|
||
bool eof;
|
||
FILE *f;
|
||
|
||
if (pid == 0)
|
||
return 0;
|
||
|
||
assert(pid > 0);
|
||
|
||
p = procfs_file_alloca(pid, "cmdline");
|
||
f = fopen(p, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
count = fread(&c, 1, 1, f);
|
||
eof = feof(f);
|
||
fclose(f);
|
||
|
||
/* Kernel threads have an empty cmdline */
|
||
|
||
if (count <= 0)
|
||
return eof ? 1 : -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_process_capeff(pid_t pid, char **capeff) {
|
||
const char *p;
|
||
|
||
assert(capeff);
|
||
assert(pid >= 0);
|
||
|
||
p = procfs_file_alloca(pid, "status");
|
||
|
||
return get_status_field(p, "\nCapEff:", capeff);
|
||
}
|
||
|
||
int get_process_exe(pid_t pid, char **name) {
|
||
const char *p;
|
||
char *d;
|
||
int r;
|
||
|
||
assert(pid >= 0);
|
||
assert(name);
|
||
|
||
p = procfs_file_alloca(pid, "exe");
|
||
|
||
r = readlink_malloc(p, name);
|
||
if (r < 0)
|
||
return r == -ENOENT ? -ESRCH : r;
|
||
|
||
d = endswith(*name, " (deleted)");
|
||
if (d)
|
||
*d = '\0';
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int get_process_id(pid_t pid, const char *field, uid_t *uid) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
char line[LINE_MAX];
|
||
const char *p;
|
||
|
||
assert(field);
|
||
assert(uid);
|
||
|
||
if (pid == 0)
|
||
return getuid();
|
||
|
||
p = procfs_file_alloca(pid, "status");
|
||
f = fopen(p, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
FOREACH_LINE(line, f, return -errno) {
|
||
char *l;
|
||
|
||
l = strstrip(line);
|
||
|
||
if (startswith(l, field)) {
|
||
l += strlen(field);
|
||
l += strspn(l, WHITESPACE);
|
||
|
||
l[strcspn(l, WHITESPACE)] = 0;
|
||
|
||
return parse_uid(l, uid);
|
||
}
|
||
}
|
||
|
||
return -EIO;
|
||
}
|
||
|
||
int get_process_uid(pid_t pid, uid_t *uid) {
|
||
return get_process_id(pid, "Uid:", uid);
|
||
}
|
||
|
||
int get_process_gid(pid_t pid, gid_t *gid) {
|
||
assert_cc(sizeof(uid_t) == sizeof(gid_t));
|
||
return get_process_id(pid, "Gid:", gid);
|
||
}
|
||
|
||
char *strnappend(const char *s, const char *suffix, size_t b) {
|
||
size_t a;
|
||
char *r;
|
||
|
||
if (!s && !suffix)
|
||
return strdup("");
|
||
|
||
if (!s)
|
||
return strndup(suffix, b);
|
||
|
||
if (!suffix)
|
||
return strdup(s);
|
||
|
||
assert(s);
|
||
assert(suffix);
|
||
|
||
a = strlen(s);
|
||
if (b > ((size_t) -1) - a)
|
||
return NULL;
|
||
|
||
r = new(char, a+b+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
memcpy(r, s, a);
|
||
memcpy(r+a, suffix, b);
|
||
r[a+b] = 0;
|
||
|
||
return r;
|
||
}
|
||
|
||
char *strappend(const char *s, const char *suffix) {
|
||
return strnappend(s, suffix, suffix ? strlen(suffix) : 0);
|
||
}
|
||
|
||
int readlinkat_malloc(int fd, const char *p, char **ret) {
|
||
size_t l = 100;
|
||
int r;
|
||
|
||
assert(p);
|
||
assert(ret);
|
||
|
||
for (;;) {
|
||
char *c;
|
||
ssize_t n;
|
||
|
||
c = new(char, l);
|
||
if (!c)
|
||
return -ENOMEM;
|
||
|
||
n = readlinkat(fd, p, c, l-1);
|
||
if (n < 0) {
|
||
r = -errno;
|
||
free(c);
|
||
return r;
|
||
}
|
||
|
||
if ((size_t) n < l-1) {
|
||
c[n] = 0;
|
||
*ret = c;
|
||
return 0;
|
||
}
|
||
|
||
free(c);
|
||
l *= 2;
|
||
}
|
||
}
|
||
|
||
int readlink_malloc(const char *p, char **ret) {
|
||
return readlinkat_malloc(AT_FDCWD, p, ret);
|
||
}
|
||
|
||
int readlink_and_make_absolute(const char *p, char **r) {
|
||
_cleanup_free_ char *target = NULL;
|
||
char *k;
|
||
int j;
|
||
|
||
assert(p);
|
||
assert(r);
|
||
|
||
j = readlink_malloc(p, &target);
|
||
if (j < 0)
|
||
return j;
|
||
|
||
k = file_in_same_dir(p, target);
|
||
if (!k)
|
||
return -ENOMEM;
|
||
|
||
*r = k;
|
||
return 0;
|
||
}
|
||
|
||
int readlink_and_canonicalize(const char *p, char **r) {
|
||
char *t, *s;
|
||
int j;
|
||
|
||
assert(p);
|
||
assert(r);
|
||
|
||
j = readlink_and_make_absolute(p, &t);
|
||
if (j < 0)
|
||
return j;
|
||
|
||
s = canonicalize_file_name(t);
|
||
if (s) {
|
||
free(t);
|
||
*r = s;
|
||
} else
|
||
*r = t;
|
||
|
||
path_kill_slashes(*r);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int reset_all_signal_handlers(void) {
|
||
int sig, r = 0;
|
||
|
||
for (sig = 1; sig < _NSIG; sig++) {
|
||
struct sigaction sa = {
|
||
.sa_handler = SIG_DFL,
|
||
.sa_flags = SA_RESTART,
|
||
};
|
||
|
||
/* These two cannot be caught... */
|
||
if (sig == SIGKILL || sig == SIGSTOP)
|
||
continue;
|
||
|
||
/* On Linux the first two RT signals are reserved by
|
||
* glibc, and sigaction() will return EINVAL for them. */
|
||
if ((sigaction(sig, &sa, NULL) < 0))
|
||
if (errno != EINVAL && r == 0)
|
||
r = -errno;
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
int reset_signal_mask(void) {
|
||
sigset_t ss;
|
||
|
||
if (sigemptyset(&ss) < 0)
|
||
return -errno;
|
||
|
||
if (sigprocmask(SIG_SETMASK, &ss, NULL) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
char *strstrip(char *s) {
|
||
char *e;
|
||
|
||
/* Drops trailing whitespace. Modifies the string in
|
||
* place. Returns pointer to first non-space character */
|
||
|
||
s += strspn(s, WHITESPACE);
|
||
|
||
for (e = strchr(s, 0); e > s; e --)
|
||
if (!strchr(WHITESPACE, e[-1]))
|
||
break;
|
||
|
||
*e = 0;
|
||
|
||
return s;
|
||
}
|
||
|
||
char *delete_chars(char *s, const char *bad) {
|
||
char *f, *t;
|
||
|
||
/* Drops all whitespace, regardless where in the string */
|
||
|
||
for (f = s, t = s; *f; f++) {
|
||
if (strchr(bad, *f))
|
||
continue;
|
||
|
||
*(t++) = *f;
|
||
}
|
||
|
||
*t = 0;
|
||
|
||
return s;
|
||
}
|
||
|
||
char *file_in_same_dir(const char *path, const char *filename) {
|
||
char *e, *r;
|
||
size_t k;
|
||
|
||
assert(path);
|
||
assert(filename);
|
||
|
||
/* This removes the last component of path and appends
|
||
* filename, unless the latter is absolute anyway or the
|
||
* former isn't */
|
||
|
||
if (path_is_absolute(filename))
|
||
return strdup(filename);
|
||
|
||
if (!(e = strrchr(path, '/')))
|
||
return strdup(filename);
|
||
|
||
k = strlen(filename);
|
||
if (!(r = new(char, e-path+1+k+1)))
|
||
return NULL;
|
||
|
||
memcpy(r, path, e-path+1);
|
||
memcpy(r+(e-path)+1, filename, k+1);
|
||
|
||
return r;
|
||
}
|
||
|
||
int rmdir_parents(const char *path, const char *stop) {
|
||
size_t l;
|
||
int r = 0;
|
||
|
||
assert(path);
|
||
assert(stop);
|
||
|
||
l = strlen(path);
|
||
|
||
/* Skip trailing slashes */
|
||
while (l > 0 && path[l-1] == '/')
|
||
l--;
|
||
|
||
while (l > 0) {
|
||
char *t;
|
||
|
||
/* Skip last component */
|
||
while (l > 0 && path[l-1] != '/')
|
||
l--;
|
||
|
||
/* Skip trailing slashes */
|
||
while (l > 0 && path[l-1] == '/')
|
||
l--;
|
||
|
||
if (l <= 0)
|
||
break;
|
||
|
||
if (!(t = strndup(path, l)))
|
||
return -ENOMEM;
|
||
|
||
if (path_startswith(stop, t)) {
|
||
free(t);
|
||
return 0;
|
||
}
|
||
|
||
r = rmdir(t);
|
||
free(t);
|
||
|
||
if (r < 0)
|
||
if (errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
char hexchar(int x) {
|
||
static const char table[16] = "0123456789abcdef";
|
||
|
||
return table[x & 15];
|
||
}
|
||
|
||
int unhexchar(char c) {
|
||
|
||
if (c >= '0' && c <= '9')
|
||
return c - '0';
|
||
|
||
if (c >= 'a' && c <= 'f')
|
||
return c - 'a' + 10;
|
||
|
||
if (c >= 'A' && c <= 'F')
|
||
return c - 'A' + 10;
|
||
|
||
return -EINVAL;
|
||
}
|
||
|
||
char *hexmem(const void *p, size_t l) {
|
||
char *r, *z;
|
||
const uint8_t *x;
|
||
|
||
z = r = malloc(l * 2 + 1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
for (x = p; x < (const uint8_t*) p + l; x++) {
|
||
*(z++) = hexchar(*x >> 4);
|
||
*(z++) = hexchar(*x & 15);
|
||
}
|
||
|
||
*z = 0;
|
||
return r;
|
||
}
|
||
|
||
void *unhexmem(const char *p, size_t l) {
|
||
uint8_t *r, *z;
|
||
const char *x;
|
||
|
||
assert(p);
|
||
|
||
z = r = malloc((l + 1) / 2 + 1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
for (x = p; x < p + l; x += 2) {
|
||
int a, b;
|
||
|
||
a = unhexchar(x[0]);
|
||
if (x+1 < p + l)
|
||
b = unhexchar(x[1]);
|
||
else
|
||
b = 0;
|
||
|
||
*(z++) = (uint8_t) a << 4 | (uint8_t) b;
|
||
}
|
||
|
||
*z = 0;
|
||
return r;
|
||
}
|
||
|
||
char octchar(int x) {
|
||
return '0' + (x & 7);
|
||
}
|
||
|
||
int unoctchar(char c) {
|
||
|
||
if (c >= '0' && c <= '7')
|
||
return c - '0';
|
||
|
||
return -EINVAL;
|
||
}
|
||
|
||
char decchar(int x) {
|
||
return '0' + (x % 10);
|
||
}
|
||
|
||
int undecchar(char c) {
|
||
|
||
if (c >= '0' && c <= '9')
|
||
return c - '0';
|
||
|
||
return -EINVAL;
|
||
}
|
||
|
||
char *cescape(const char *s) {
|
||
char *r, *t;
|
||
const char *f;
|
||
|
||
assert(s);
|
||
|
||
/* Does C style string escaping. */
|
||
|
||
r = new(char, strlen(s)*4 + 1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
for (f = s, t = r; *f; f++)
|
||
|
||
switch (*f) {
|
||
|
||
case '\a':
|
||
*(t++) = '\\';
|
||
*(t++) = 'a';
|
||
break;
|
||
case '\b':
|
||
*(t++) = '\\';
|
||
*(t++) = 'b';
|
||
break;
|
||
case '\f':
|
||
*(t++) = '\\';
|
||
*(t++) = 'f';
|
||
break;
|
||
case '\n':
|
||
*(t++) = '\\';
|
||
*(t++) = 'n';
|
||
break;
|
||
case '\r':
|
||
*(t++) = '\\';
|
||
*(t++) = 'r';
|
||
break;
|
||
case '\t':
|
||
*(t++) = '\\';
|
||
*(t++) = 't';
|
||
break;
|
||
case '\v':
|
||
*(t++) = '\\';
|
||
*(t++) = 'v';
|
||
break;
|
||
case '\\':
|
||
*(t++) = '\\';
|
||
*(t++) = '\\';
|
||
break;
|
||
case '"':
|
||
*(t++) = '\\';
|
||
*(t++) = '"';
|
||
break;
|
||
case '\'':
|
||
*(t++) = '\\';
|
||
*(t++) = '\'';
|
||
break;
|
||
|
||
default:
|
||
/* For special chars we prefer octal over
|
||
* hexadecimal encoding, simply because glib's
|
||
* g_strescape() does the same */
|
||
if ((*f < ' ') || (*f >= 127)) {
|
||
*(t++) = '\\';
|
||
*(t++) = octchar((unsigned char) *f >> 6);
|
||
*(t++) = octchar((unsigned char) *f >> 3);
|
||
*(t++) = octchar((unsigned char) *f);
|
||
} else
|
||
*(t++) = *f;
|
||
break;
|
||
}
|
||
|
||
*t = 0;
|
||
|
||
return r;
|
||
}
|
||
|
||
char *cunescape_length_with_prefix(const char *s, size_t length, const char *prefix) {
|
||
char *r, *t;
|
||
const char *f;
|
||
size_t pl;
|
||
|
||
assert(s);
|
||
|
||
/* Undoes C style string escaping, and optionally prefixes it. */
|
||
|
||
pl = prefix ? strlen(prefix) : 0;
|
||
|
||
r = new(char, pl+length+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
if (prefix)
|
||
memcpy(r, prefix, pl);
|
||
|
||
for (f = s, t = r + pl; f < s + length; f++) {
|
||
|
||
if (*f != '\\') {
|
||
*(t++) = *f;
|
||
continue;
|
||
}
|
||
|
||
f++;
|
||
|
||
switch (*f) {
|
||
|
||
case 'a':
|
||
*(t++) = '\a';
|
||
break;
|
||
case 'b':
|
||
*(t++) = '\b';
|
||
break;
|
||
case 'f':
|
||
*(t++) = '\f';
|
||
break;
|
||
case 'n':
|
||
*(t++) = '\n';
|
||
break;
|
||
case 'r':
|
||
*(t++) = '\r';
|
||
break;
|
||
case 't':
|
||
*(t++) = '\t';
|
||
break;
|
||
case 'v':
|
||
*(t++) = '\v';
|
||
break;
|
||
case '\\':
|
||
*(t++) = '\\';
|
||
break;
|
||
case '"':
|
||
*(t++) = '"';
|
||
break;
|
||
case '\'':
|
||
*(t++) = '\'';
|
||
break;
|
||
|
||
case 's':
|
||
/* This is an extension of the XDG syntax files */
|
||
*(t++) = ' ';
|
||
break;
|
||
|
||
case 'x': {
|
||
/* hexadecimal encoding */
|
||
int a, b;
|
||
|
||
a = unhexchar(f[1]);
|
||
b = unhexchar(f[2]);
|
||
|
||
if (a < 0 || b < 0 || (a == 0 && b == 0)) {
|
||
/* Invalid escape code, let's take it literal then */
|
||
*(t++) = '\\';
|
||
*(t++) = 'x';
|
||
} else {
|
||
*(t++) = (char) ((a << 4) | b);
|
||
f += 2;
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7': {
|
||
/* octal encoding */
|
||
int a, b, c;
|
||
|
||
a = unoctchar(f[0]);
|
||
b = unoctchar(f[1]);
|
||
c = unoctchar(f[2]);
|
||
|
||
if (a < 0 || b < 0 || c < 0 || (a == 0 && b == 0 && c == 0)) {
|
||
/* Invalid escape code, let's take it literal then */
|
||
*(t++) = '\\';
|
||
*(t++) = f[0];
|
||
} else {
|
||
*(t++) = (char) ((a << 6) | (b << 3) | c);
|
||
f += 2;
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
case 0:
|
||
/* premature end of string.*/
|
||
*(t++) = '\\';
|
||
goto finish;
|
||
|
||
default:
|
||
/* Invalid escape code, let's take it literal then */
|
||
*(t++) = '\\';
|
||
*(t++) = *f;
|
||
break;
|
||
}
|
||
}
|
||
|
||
finish:
|
||
*t = 0;
|
||
return r;
|
||
}
|
||
|
||
char *cunescape_length(const char *s, size_t length) {
|
||
return cunescape_length_with_prefix(s, length, NULL);
|
||
}
|
||
|
||
char *cunescape(const char *s) {
|
||
assert(s);
|
||
|
||
return cunescape_length(s, strlen(s));
|
||
}
|
||
|
||
char *xescape(const char *s, const char *bad) {
|
||
char *r, *t;
|
||
const char *f;
|
||
|
||
/* Escapes all chars in bad, in addition to \ and all special
|
||
* chars, in \xFF style escaping. May be reversed with
|
||
* cunescape. */
|
||
|
||
r = new(char, strlen(s) * 4 + 1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
for (f = s, t = r; *f; f++) {
|
||
|
||
if ((*f < ' ') || (*f >= 127) ||
|
||
(*f == '\\') || strchr(bad, *f)) {
|
||
*(t++) = '\\';
|
||
*(t++) = 'x';
|
||
*(t++) = hexchar(*f >> 4);
|
||
*(t++) = hexchar(*f);
|
||
} else
|
||
*(t++) = *f;
|
||
}
|
||
|
||
*t = 0;
|
||
|
||
return r;
|
||
}
|
||
|
||
char *ascii_strlower(char *t) {
|
||
char *p;
|
||
|
||
assert(t);
|
||
|
||
for (p = t; *p; p++)
|
||
if (*p >= 'A' && *p <= 'Z')
|
||
*p = *p - 'A' + 'a';
|
||
|
||
return t;
|
||
}
|
||
|
||
_pure_ static bool ignore_file_allow_backup(const char *filename) {
|
||
assert(filename);
|
||
|
||
return
|
||
filename[0] == '.' ||
|
||
streq(filename, "lost+found") ||
|
||
streq(filename, "aquota.user") ||
|
||
streq(filename, "aquota.group") ||
|
||
endswith(filename, ".rpmnew") ||
|
||
endswith(filename, ".rpmsave") ||
|
||
endswith(filename, ".rpmorig") ||
|
||
endswith(filename, ".dpkg-old") ||
|
||
endswith(filename, ".dpkg-new") ||
|
||
endswith(filename, ".dpkg-tmp") ||
|
||
endswith(filename, ".swp");
|
||
}
|
||
|
||
bool ignore_file(const char *filename) {
|
||
assert(filename);
|
||
|
||
if (endswith(filename, "~"))
|
||
return true;
|
||
|
||
return ignore_file_allow_backup(filename);
|
||
}
|
||
|
||
int fd_nonblock(int fd, bool nonblock) {
|
||
int flags, nflags;
|
||
|
||
assert(fd >= 0);
|
||
|
||
flags = fcntl(fd, F_GETFL, 0);
|
||
if (flags < 0)
|
||
return -errno;
|
||
|
||
if (nonblock)
|
||
nflags = flags | O_NONBLOCK;
|
||
else
|
||
nflags = flags & ~O_NONBLOCK;
|
||
|
||
if (nflags == flags)
|
||
return 0;
|
||
|
||
if (fcntl(fd, F_SETFL, nflags) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fd_cloexec(int fd, bool cloexec) {
|
||
int flags, nflags;
|
||
|
||
assert(fd >= 0);
|
||
|
||
flags = fcntl(fd, F_GETFD, 0);
|
||
if (flags < 0)
|
||
return -errno;
|
||
|
||
if (cloexec)
|
||
nflags = flags | FD_CLOEXEC;
|
||
else
|
||
nflags = flags & ~FD_CLOEXEC;
|
||
|
||
if (nflags == flags)
|
||
return 0;
|
||
|
||
if (fcntl(fd, F_SETFD, nflags) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
_pure_ static bool fd_in_set(int fd, const int fdset[], unsigned n_fdset) {
|
||
unsigned i;
|
||
|
||
assert(n_fdset == 0 || fdset);
|
||
|
||
for (i = 0; i < n_fdset; i++)
|
||
if (fdset[i] == fd)
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
int close_all_fds(const int except[], unsigned n_except) {
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
struct dirent *de;
|
||
int r = 0;
|
||
|
||
assert(n_except == 0 || except);
|
||
|
||
d = opendir("/proc/self/fd");
|
||
if (!d) {
|
||
int fd;
|
||
struct rlimit rl;
|
||
|
||
/* When /proc isn't available (for example in chroots)
|
||
* the fallback is brute forcing through the fd
|
||
* table */
|
||
|
||
assert_se(getrlimit(RLIMIT_NOFILE, &rl) >= 0);
|
||
for (fd = 3; fd < (int) rl.rlim_max; fd ++) {
|
||
|
||
if (fd_in_set(fd, except, n_except))
|
||
continue;
|
||
|
||
if (close_nointr(fd) < 0)
|
||
if (errno != EBADF && r == 0)
|
||
r = -errno;
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
while ((de = readdir(d))) {
|
||
int fd = -1;
|
||
|
||
if (ignore_file(de->d_name))
|
||
continue;
|
||
|
||
if (safe_atoi(de->d_name, &fd) < 0)
|
||
/* Let's better ignore this, just in case */
|
||
continue;
|
||
|
||
if (fd < 3)
|
||
continue;
|
||
|
||
if (fd == dirfd(d))
|
||
continue;
|
||
|
||
if (fd_in_set(fd, except, n_except))
|
||
continue;
|
||
|
||
if (close_nointr(fd) < 0) {
|
||
/* Valgrind has its own FD and doesn't want to have it closed */
|
||
if (errno != EBADF && r == 0)
|
||
r = -errno;
|
||
}
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
bool chars_intersect(const char *a, const char *b) {
|
||
const char *p;
|
||
|
||
/* Returns true if any of the chars in a are in b. */
|
||
for (p = a; *p; p++)
|
||
if (strchr(b, *p))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
bool fstype_is_network(const char *fstype) {
|
||
static const char table[] =
|
||
"cifs\0"
|
||
"smbfs\0"
|
||
"sshfs\0"
|
||
"ncpfs\0"
|
||
"ncp\0"
|
||
"nfs\0"
|
||
"nfs4\0"
|
||
"gfs\0"
|
||
"gfs2\0"
|
||
"glusterfs\0";
|
||
|
||
const char *x;
|
||
|
||
x = startswith(fstype, "fuse.");
|
||
if (x)
|
||
fstype = x;
|
||
|
||
return nulstr_contains(table, fstype);
|
||
}
|
||
|
||
int chvt(int vt) {
|
||
_cleanup_close_ int fd;
|
||
|
||
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
if (vt < 0) {
|
||
int tiocl[2] = {
|
||
TIOCL_GETKMSGREDIRECT,
|
||
0
|
||
};
|
||
|
||
if (ioctl(fd, TIOCLINUX, tiocl) < 0)
|
||
return -errno;
|
||
|
||
vt = tiocl[0] <= 0 ? 1 : tiocl[0];
|
||
}
|
||
|
||
if (ioctl(fd, VT_ACTIVATE, vt) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int read_one_char(FILE *f, char *ret, usec_t t, bool *need_nl) {
|
||
struct termios old_termios, new_termios;
|
||
char c, line[LINE_MAX];
|
||
|
||
assert(f);
|
||
assert(ret);
|
||
|
||
if (tcgetattr(fileno(f), &old_termios) >= 0) {
|
||
new_termios = old_termios;
|
||
|
||
new_termios.c_lflag &= ~ICANON;
|
||
new_termios.c_cc[VMIN] = 1;
|
||
new_termios.c_cc[VTIME] = 0;
|
||
|
||
if (tcsetattr(fileno(f), TCSADRAIN, &new_termios) >= 0) {
|
||
size_t k;
|
||
|
||
if (t != USEC_INFINITY) {
|
||
if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0) {
|
||
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
|
||
return -ETIMEDOUT;
|
||
}
|
||
}
|
||
|
||
k = fread(&c, 1, 1, f);
|
||
|
||
tcsetattr(fileno(f), TCSADRAIN, &old_termios);
|
||
|
||
if (k <= 0)
|
||
return -EIO;
|
||
|
||
if (need_nl)
|
||
*need_nl = c != '\n';
|
||
|
||
*ret = c;
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (t != USEC_INFINITY) {
|
||
if (fd_wait_for_event(fileno(f), POLLIN, t) <= 0)
|
||
return -ETIMEDOUT;
|
||
}
|
||
|
||
errno = 0;
|
||
if (!fgets(line, sizeof(line), f))
|
||
return errno ? -errno : -EIO;
|
||
|
||
truncate_nl(line);
|
||
|
||
if (strlen(line) != 1)
|
||
return -EBADMSG;
|
||
|
||
if (need_nl)
|
||
*need_nl = false;
|
||
|
||
*ret = line[0];
|
||
return 0;
|
||
}
|
||
|
||
int ask_char(char *ret, const char *replies, const char *text, ...) {
|
||
int r;
|
||
|
||
assert(ret);
|
||
assert(replies);
|
||
assert(text);
|
||
|
||
for (;;) {
|
||
va_list ap;
|
||
char c;
|
||
bool need_nl = true;
|
||
|
||
if (on_tty())
|
||
fputs(ANSI_HIGHLIGHT_ON, stdout);
|
||
|
||
va_start(ap, text);
|
||
vprintf(text, ap);
|
||
va_end(ap);
|
||
|
||
if (on_tty())
|
||
fputs(ANSI_HIGHLIGHT_OFF, stdout);
|
||
|
||
fflush(stdout);
|
||
|
||
r = read_one_char(stdin, &c, USEC_INFINITY, &need_nl);
|
||
if (r < 0) {
|
||
|
||
if (r == -EBADMSG) {
|
||
puts("Bad input, please try again.");
|
||
continue;
|
||
}
|
||
|
||
putchar('\n');
|
||
return r;
|
||
}
|
||
|
||
if (need_nl)
|
||
putchar('\n');
|
||
|
||
if (strchr(replies, c)) {
|
||
*ret = c;
|
||
return 0;
|
||
}
|
||
|
||
puts("Read unexpected character, please try again.");
|
||
}
|
||
}
|
||
|
||
int ask_string(char **ret, const char *text, ...) {
|
||
assert(ret);
|
||
assert(text);
|
||
|
||
for (;;) {
|
||
char line[LINE_MAX];
|
||
va_list ap;
|
||
|
||
if (on_tty())
|
||
fputs(ANSI_HIGHLIGHT_ON, stdout);
|
||
|
||
va_start(ap, text);
|
||
vprintf(text, ap);
|
||
va_end(ap);
|
||
|
||
if (on_tty())
|
||
fputs(ANSI_HIGHLIGHT_OFF, stdout);
|
||
|
||
fflush(stdout);
|
||
|
||
errno = 0;
|
||
if (!fgets(line, sizeof(line), stdin))
|
||
return errno ? -errno : -EIO;
|
||
|
||
if (!endswith(line, "\n"))
|
||
putchar('\n');
|
||
else {
|
||
char *s;
|
||
|
||
if (isempty(line))
|
||
continue;
|
||
|
||
truncate_nl(line);
|
||
s = strdup(line);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
*ret = s;
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
int reset_terminal_fd(int fd, bool switch_to_text) {
|
||
struct termios termios;
|
||
int r = 0;
|
||
|
||
/* Set terminal to some sane defaults */
|
||
|
||
assert(fd >= 0);
|
||
|
||
/* We leave locked terminal attributes untouched, so that
|
||
* Plymouth may set whatever it wants to set, and we don't
|
||
* interfere with that. */
|
||
|
||
/* Disable exclusive mode, just in case */
|
||
ioctl(fd, TIOCNXCL);
|
||
|
||
/* Switch to text mode */
|
||
if (switch_to_text)
|
||
ioctl(fd, KDSETMODE, KD_TEXT);
|
||
|
||
/* Enable console unicode mode */
|
||
ioctl(fd, KDSKBMODE, K_UNICODE);
|
||
|
||
if (tcgetattr(fd, &termios) < 0) {
|
||
r = -errno;
|
||
goto finish;
|
||
}
|
||
|
||
/* We only reset the stuff that matters to the software. How
|
||
* hardware is set up we don't touch assuming that somebody
|
||
* else will do that for us */
|
||
|
||
termios.c_iflag &= ~(IGNBRK | BRKINT | ISTRIP | INLCR | IGNCR | IUCLC);
|
||
termios.c_iflag |= ICRNL | IMAXBEL | IUTF8;
|
||
termios.c_oflag |= ONLCR;
|
||
termios.c_cflag |= CREAD;
|
||
termios.c_lflag = ISIG | ICANON | IEXTEN | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOPRT | ECHOKE;
|
||
|
||
termios.c_cc[VINTR] = 03; /* ^C */
|
||
termios.c_cc[VQUIT] = 034; /* ^\ */
|
||
termios.c_cc[VERASE] = 0177;
|
||
termios.c_cc[VKILL] = 025; /* ^X */
|
||
termios.c_cc[VEOF] = 04; /* ^D */
|
||
termios.c_cc[VSTART] = 021; /* ^Q */
|
||
termios.c_cc[VSTOP] = 023; /* ^S */
|
||
termios.c_cc[VSUSP] = 032; /* ^Z */
|
||
termios.c_cc[VLNEXT] = 026; /* ^V */
|
||
termios.c_cc[VWERASE] = 027; /* ^W */
|
||
termios.c_cc[VREPRINT] = 022; /* ^R */
|
||
termios.c_cc[VEOL] = 0;
|
||
termios.c_cc[VEOL2] = 0;
|
||
|
||
termios.c_cc[VTIME] = 0;
|
||
termios.c_cc[VMIN] = 1;
|
||
|
||
if (tcsetattr(fd, TCSANOW, &termios) < 0)
|
||
r = -errno;
|
||
|
||
finish:
|
||
/* Just in case, flush all crap out */
|
||
tcflush(fd, TCIOFLUSH);
|
||
|
||
return r;
|
||
}
|
||
|
||
int reset_terminal(const char *name) {
|
||
_cleanup_close_ int fd = -1;
|
||
|
||
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
return reset_terminal_fd(fd, true);
|
||
}
|
||
|
||
int open_terminal(const char *name, int mode) {
|
||
int fd, r;
|
||
unsigned c = 0;
|
||
|
||
/*
|
||
* If a TTY is in the process of being closed opening it might
|
||
* cause EIO. This is horribly awful, but unlikely to be
|
||
* changed in the kernel. Hence we work around this problem by
|
||
* retrying a couple of times.
|
||
*
|
||
* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/554172/comments/245
|
||
*/
|
||
|
||
assert(!(mode & O_CREAT));
|
||
|
||
for (;;) {
|
||
fd = open(name, mode, 0);
|
||
if (fd >= 0)
|
||
break;
|
||
|
||
if (errno != EIO)
|
||
return -errno;
|
||
|
||
/* Max 1s in total */
|
||
if (c >= 20)
|
||
return -errno;
|
||
|
||
usleep(50 * USEC_PER_MSEC);
|
||
c++;
|
||
}
|
||
|
||
r = isatty(fd);
|
||
if (r < 0) {
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
if (!r) {
|
||
safe_close(fd);
|
||
return -ENOTTY;
|
||
}
|
||
|
||
return fd;
|
||
}
|
||
|
||
int flush_fd(int fd) {
|
||
struct pollfd pollfd = {
|
||
.fd = fd,
|
||
.events = POLLIN,
|
||
};
|
||
|
||
for (;;) {
|
||
char buf[LINE_MAX];
|
||
ssize_t l;
|
||
int r;
|
||
|
||
r = poll(&pollfd, 1, 0);
|
||
if (r < 0) {
|
||
if (errno == EINTR)
|
||
continue;
|
||
|
||
return -errno;
|
||
|
||
} else if (r == 0)
|
||
return 0;
|
||
|
||
l = read(fd, buf, sizeof(buf));
|
||
if (l < 0) {
|
||
|
||
if (errno == EINTR)
|
||
continue;
|
||
|
||
if (errno == EAGAIN)
|
||
return 0;
|
||
|
||
return -errno;
|
||
} else if (l == 0)
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
int acquire_terminal(
|
||
const char *name,
|
||
bool fail,
|
||
bool force,
|
||
bool ignore_tiocstty_eperm,
|
||
usec_t timeout) {
|
||
|
||
int fd = -1, notify = -1, r = 0, wd = -1;
|
||
usec_t ts = 0;
|
||
|
||
assert(name);
|
||
|
||
/* We use inotify to be notified when the tty is closed. We
|
||
* create the watch before checking if we can actually acquire
|
||
* it, so that we don't lose any event.
|
||
*
|
||
* Note: strictly speaking this actually watches for the
|
||
* device being closed, it does *not* really watch whether a
|
||
* tty loses its controlling process. However, unless some
|
||
* rogue process uses TIOCNOTTY on /dev/tty *after* closing
|
||
* its tty otherwise this will not become a problem. As long
|
||
* as the administrator makes sure not configure any service
|
||
* on the same tty as an untrusted user this should not be a
|
||
* problem. (Which he probably should not do anyway.) */
|
||
|
||
if (timeout != USEC_INFINITY)
|
||
ts = now(CLOCK_MONOTONIC);
|
||
|
||
if (!fail && !force) {
|
||
notify = inotify_init1(IN_CLOEXEC | (timeout != USEC_INFINITY ? IN_NONBLOCK : 0));
|
||
if (notify < 0) {
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
|
||
wd = inotify_add_watch(notify, name, IN_CLOSE);
|
||
if (wd < 0) {
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
}
|
||
|
||
for (;;) {
|
||
struct sigaction sa_old, sa_new = {
|
||
.sa_handler = SIG_IGN,
|
||
.sa_flags = SA_RESTART,
|
||
};
|
||
|
||
if (notify >= 0) {
|
||
r = flush_fd(notify);
|
||
if (r < 0)
|
||
goto fail;
|
||
}
|
||
|
||
/* We pass here O_NOCTTY only so that we can check the return
|
||
* value TIOCSCTTY and have a reliable way to figure out if we
|
||
* successfully became the controlling process of the tty */
|
||
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
|
||
* if we already own the tty. */
|
||
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
||
|
||
/* First, try to get the tty */
|
||
if (ioctl(fd, TIOCSCTTY, force) < 0)
|
||
r = -errno;
|
||
|
||
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
||
|
||
/* Sometimes it makes sense to ignore TIOCSCTTY
|
||
* returning EPERM, i.e. when very likely we already
|
||
* are have this controlling terminal. */
|
||
if (r < 0 && r == -EPERM && ignore_tiocstty_eperm)
|
||
r = 0;
|
||
|
||
if (r < 0 && (force || fail || r != -EPERM)) {
|
||
goto fail;
|
||
}
|
||
|
||
if (r >= 0)
|
||
break;
|
||
|
||
assert(!fail);
|
||
assert(!force);
|
||
assert(notify >= 0);
|
||
|
||
for (;;) {
|
||
uint8_t inotify_buffer[sizeof(struct inotify_event) + FILENAME_MAX];
|
||
ssize_t l;
|
||
struct inotify_event *e;
|
||
|
||
if (timeout != USEC_INFINITY) {
|
||
usec_t n;
|
||
|
||
n = now(CLOCK_MONOTONIC);
|
||
if (ts + timeout < n) {
|
||
r = -ETIMEDOUT;
|
||
goto fail;
|
||
}
|
||
|
||
r = fd_wait_for_event(fd, POLLIN, ts + timeout - n);
|
||
if (r < 0)
|
||
goto fail;
|
||
|
||
if (r == 0) {
|
||
r = -ETIMEDOUT;
|
||
goto fail;
|
||
}
|
||
}
|
||
|
||
l = read(notify, inotify_buffer, sizeof(inotify_buffer));
|
||
if (l < 0) {
|
||
|
||
if (errno == EINTR || errno == EAGAIN)
|
||
continue;
|
||
|
||
r = -errno;
|
||
goto fail;
|
||
}
|
||
|
||
e = (struct inotify_event*) inotify_buffer;
|
||
|
||
while (l > 0) {
|
||
size_t step;
|
||
|
||
if (e->wd != wd || !(e->mask & IN_CLOSE)) {
|
||
r = -EIO;
|
||
goto fail;
|
||
}
|
||
|
||
step = sizeof(struct inotify_event) + e->len;
|
||
assert(step <= (size_t) l);
|
||
|
||
e = (struct inotify_event*) ((uint8_t*) e + step);
|
||
l -= step;
|
||
}
|
||
|
||
break;
|
||
}
|
||
|
||
/* We close the tty fd here since if the old session
|
||
* ended our handle will be dead. It's important that
|
||
* we do this after sleeping, so that we don't enter
|
||
* an endless loop. */
|
||
fd = safe_close(fd);
|
||
}
|
||
|
||
safe_close(notify);
|
||
|
||
r = reset_terminal_fd(fd, true);
|
||
if (r < 0)
|
||
log_warning("Failed to reset terminal: %s", strerror(-r));
|
||
|
||
return fd;
|
||
|
||
fail:
|
||
safe_close(fd);
|
||
safe_close(notify);
|
||
|
||
return r;
|
||
}
|
||
|
||
int release_terminal(void) {
|
||
static const struct sigaction sa_new = {
|
||
.sa_handler = SIG_IGN,
|
||
.sa_flags = SA_RESTART,
|
||
};
|
||
|
||
_cleanup_close_ int fd = -1;
|
||
struct sigaction sa_old;
|
||
int r = 0;
|
||
|
||
fd = open("/dev/tty", O_RDWR|O_NOCTTY|O_NDELAY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
/* Temporarily ignore SIGHUP, so that we don't get SIGHUP'ed
|
||
* by our own TIOCNOTTY */
|
||
assert_se(sigaction(SIGHUP, &sa_new, &sa_old) == 0);
|
||
|
||
if (ioctl(fd, TIOCNOTTY) < 0)
|
||
r = -errno;
|
||
|
||
assert_se(sigaction(SIGHUP, &sa_old, NULL) == 0);
|
||
|
||
return r;
|
||
}
|
||
|
||
int sigaction_many(const struct sigaction *sa, ...) {
|
||
va_list ap;
|
||
int r = 0, sig;
|
||
|
||
va_start(ap, sa);
|
||
while ((sig = va_arg(ap, int)) > 0)
|
||
if (sigaction(sig, sa, NULL) < 0)
|
||
r = -errno;
|
||
va_end(ap);
|
||
|
||
return r;
|
||
}
|
||
|
||
int ignore_signals(int sig, ...) {
|
||
struct sigaction sa = {
|
||
.sa_handler = SIG_IGN,
|
||
.sa_flags = SA_RESTART,
|
||
};
|
||
va_list ap;
|
||
int r = 0;
|
||
|
||
if (sigaction(sig, &sa, NULL) < 0)
|
||
r = -errno;
|
||
|
||
va_start(ap, sig);
|
||
while ((sig = va_arg(ap, int)) > 0)
|
||
if (sigaction(sig, &sa, NULL) < 0)
|
||
r = -errno;
|
||
va_end(ap);
|
||
|
||
return r;
|
||
}
|
||
|
||
int default_signals(int sig, ...) {
|
||
struct sigaction sa = {
|
||
.sa_handler = SIG_DFL,
|
||
.sa_flags = SA_RESTART,
|
||
};
|
||
va_list ap;
|
||
int r = 0;
|
||
|
||
if (sigaction(sig, &sa, NULL) < 0)
|
||
r = -errno;
|
||
|
||
va_start(ap, sig);
|
||
while ((sig = va_arg(ap, int)) > 0)
|
||
if (sigaction(sig, &sa, NULL) < 0)
|
||
r = -errno;
|
||
va_end(ap);
|
||
|
||
return r;
|
||
}
|
||
|
||
void safe_close_pair(int p[]) {
|
||
assert(p);
|
||
|
||
if (p[0] == p[1]) {
|
||
/* Special case pairs which use the same fd in both
|
||
* directions... */
|
||
p[0] = p[1] = safe_close(p[0]);
|
||
return;
|
||
}
|
||
|
||
p[0] = safe_close(p[0]);
|
||
p[1] = safe_close(p[1]);
|
||
}
|
||
|
||
ssize_t loop_read(int fd, void *buf, size_t nbytes, bool do_poll) {
|
||
uint8_t *p = buf;
|
||
ssize_t n = 0;
|
||
|
||
assert(fd >= 0);
|
||
assert(buf);
|
||
|
||
while (nbytes > 0) {
|
||
ssize_t k;
|
||
|
||
k = read(fd, p, nbytes);
|
||
if (k < 0 && errno == EINTR)
|
||
continue;
|
||
|
||
if (k < 0 && errno == EAGAIN && do_poll) {
|
||
|
||
/* We knowingly ignore any return value here,
|
||
* and expect that any error/EOF is reported
|
||
* via read() */
|
||
|
||
fd_wait_for_event(fd, POLLIN, USEC_INFINITY);
|
||
continue;
|
||
}
|
||
|
||
if (k <= 0)
|
||
return n > 0 ? n : (k < 0 ? -errno : 0);
|
||
|
||
p += k;
|
||
nbytes -= k;
|
||
n += k;
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
ssize_t loop_write(int fd, const void *buf, size_t nbytes, bool do_poll) {
|
||
const uint8_t *p = buf;
|
||
ssize_t n = 0;
|
||
|
||
assert(fd >= 0);
|
||
assert(buf);
|
||
|
||
while (nbytes > 0) {
|
||
ssize_t k;
|
||
|
||
k = write(fd, p, nbytes);
|
||
if (k < 0 && errno == EINTR)
|
||
continue;
|
||
|
||
if (k < 0 && errno == EAGAIN && do_poll) {
|
||
|
||
/* We knowingly ignore any return value here,
|
||
* and expect that any error/EOF is reported
|
||
* via write() */
|
||
|
||
fd_wait_for_event(fd, POLLOUT, USEC_INFINITY);
|
||
continue;
|
||
}
|
||
|
||
if (k <= 0)
|
||
return n > 0 ? n : (k < 0 ? -errno : 0);
|
||
|
||
p += k;
|
||
nbytes -= k;
|
||
n += k;
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
int parse_size(const char *t, off_t base, off_t *size) {
|
||
|
||
/* Soo, sometimes we want to parse IEC binary suffxies, and
|
||
* sometimes SI decimal suffixes. This function can parse
|
||
* both. Which one is the right way depends on the
|
||
* context. Wikipedia suggests that SI is customary for
|
||
* hardrware metrics and network speeds, while IEC is
|
||
* customary for most data sizes used by software and volatile
|
||
* (RAM) memory. Hence be careful which one you pick!
|
||
*
|
||
* In either case we use just K, M, G as suffix, and not Ki,
|
||
* Mi, Gi or so (as IEC would suggest). That's because that's
|
||
* frickin' ugly. But this means you really need to make sure
|
||
* to document which base you are parsing when you use this
|
||
* call. */
|
||
|
||
struct table {
|
||
const char *suffix;
|
||
unsigned long long factor;
|
||
};
|
||
|
||
static const struct table iec[] = {
|
||
{ "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "T", 1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "G", 1024ULL*1024ULL*1024ULL },
|
||
{ "M", 1024ULL*1024ULL },
|
||
{ "K", 1024ULL },
|
||
{ "B", 1 },
|
||
{ "", 1 },
|
||
};
|
||
|
||
static const struct table si[] = {
|
||
{ "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
|
||
{ "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
|
||
{ "T", 1000ULL*1000ULL*1000ULL*1000ULL },
|
||
{ "G", 1000ULL*1000ULL*1000ULL },
|
||
{ "M", 1000ULL*1000ULL },
|
||
{ "K", 1000ULL },
|
||
{ "B", 1 },
|
||
{ "", 1 },
|
||
};
|
||
|
||
const struct table *table;
|
||
const char *p;
|
||
unsigned long long r = 0;
|
||
unsigned n_entries, start_pos = 0;
|
||
|
||
assert(t);
|
||
assert(base == 1000 || base == 1024);
|
||
assert(size);
|
||
|
||
if (base == 1000) {
|
||
table = si;
|
||
n_entries = ELEMENTSOF(si);
|
||
} else {
|
||
table = iec;
|
||
n_entries = ELEMENTSOF(iec);
|
||
}
|
||
|
||
p = t;
|
||
do {
|
||
long long l;
|
||
unsigned long long l2;
|
||
double frac = 0;
|
||
char *e;
|
||
unsigned i;
|
||
|
||
errno = 0;
|
||
l = strtoll(p, &e, 10);
|
||
|
||
if (errno > 0)
|
||
return -errno;
|
||
|
||
if (l < 0)
|
||
return -ERANGE;
|
||
|
||
if (e == p)
|
||
return -EINVAL;
|
||
|
||
if (*e == '.') {
|
||
e++;
|
||
if (*e >= '0' && *e <= '9') {
|
||
char *e2;
|
||
|
||
/* strotoull itself would accept space/+/- */
|
||
l2 = strtoull(e, &e2, 10);
|
||
|
||
if (errno == ERANGE)
|
||
return -errno;
|
||
|
||
/* Ignore failure. E.g. 10.M is valid */
|
||
frac = l2;
|
||
for (; e < e2; e++)
|
||
frac /= 10;
|
||
}
|
||
}
|
||
|
||
e += strspn(e, WHITESPACE);
|
||
|
||
for (i = start_pos; i < n_entries; i++)
|
||
if (startswith(e, table[i].suffix)) {
|
||
unsigned long long tmp;
|
||
if ((unsigned long long) l + (frac > 0) > ULLONG_MAX / table[i].factor)
|
||
return -ERANGE;
|
||
tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor);
|
||
if (tmp > ULLONG_MAX - r)
|
||
return -ERANGE;
|
||
|
||
r += tmp;
|
||
if ((unsigned long long) (off_t) r != r)
|
||
return -ERANGE;
|
||
|
||
p = e + strlen(table[i].suffix);
|
||
|
||
start_pos = i + 1;
|
||
break;
|
||
}
|
||
|
||
if (i >= n_entries)
|
||
return -EINVAL;
|
||
|
||
} while (*p);
|
||
|
||
*size = r;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int make_stdio(int fd) {
|
||
int r, s, t;
|
||
|
||
assert(fd >= 0);
|
||
|
||
r = dup3(fd, STDIN_FILENO, 0);
|
||
s = dup3(fd, STDOUT_FILENO, 0);
|
||
t = dup3(fd, STDERR_FILENO, 0);
|
||
|
||
if (fd >= 3)
|
||
safe_close(fd);
|
||
|
||
if (r < 0 || s < 0 || t < 0)
|
||
return -errno;
|
||
|
||
/* We rely here that the new fd has O_CLOEXEC not set */
|
||
|
||
return 0;
|
||
}
|
||
|
||
int make_null_stdio(void) {
|
||
int null_fd;
|
||
|
||
null_fd = open("/dev/null", O_RDWR|O_NOCTTY);
|
||
if (null_fd < 0)
|
||
return -errno;
|
||
|
||
return make_stdio(null_fd);
|
||
}
|
||
|
||
bool is_device_path(const char *path) {
|
||
|
||
/* Returns true on paths that refer to a device, either in
|
||
* sysfs or in /dev */
|
||
|
||
return
|
||
path_startswith(path, "/dev/") ||
|
||
path_startswith(path, "/sys/");
|
||
}
|
||
|
||
int dir_is_empty(const char *path) {
|
||
_cleanup_closedir_ DIR *d;
|
||
|
||
d = opendir(path);
|
||
if (!d)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de && errno != 0)
|
||
return -errno;
|
||
|
||
if (!de)
|
||
return 1;
|
||
|
||
if (!ignore_file(de->d_name))
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
char* dirname_malloc(const char *path) {
|
||
char *d, *dir, *dir2;
|
||
|
||
d = strdup(path);
|
||
if (!d)
|
||
return NULL;
|
||
dir = dirname(d);
|
||
assert(dir);
|
||
|
||
if (dir != d) {
|
||
dir2 = strdup(dir);
|
||
free(d);
|
||
return dir2;
|
||
}
|
||
|
||
return dir;
|
||
}
|
||
|
||
int dev_urandom(void *p, size_t n) {
|
||
static int have_syscall = -1;
|
||
int r, fd;
|
||
ssize_t k;
|
||
|
||
/* Gathers some randomness from the kernel. This call will
|
||
* never block, and will always return some data from the
|
||
* kernel, regardless if the random pool is fully initialized
|
||
* or not. It thus makes no guarantee for the quality of the
|
||
* returned entropy, but is good enough for or usual usecases
|
||
* of seeding the hash functions for hashtable */
|
||
|
||
/* Use the getrandom() syscall unless we know we don't have
|
||
* it, or when the requested size is too large for it. */
|
||
if (have_syscall != 0 || (size_t) (int) n != n) {
|
||
r = getrandom(p, n, GRND_NONBLOCK);
|
||
if (r == (int) n) {
|
||
have_syscall = true;
|
||
return 0;
|
||
}
|
||
|
||
if (r < 0) {
|
||
if (errno == ENOSYS)
|
||
/* we lack the syscall, continue with
|
||
* reading from /dev/urandom */
|
||
have_syscall = false;
|
||
else if (errno == EAGAIN)
|
||
/* not enough entropy for now. Let's
|
||
* remember to use the syscall the
|
||
* next time, again, but also read
|
||
* from /dev/urandom for now, which
|
||
* doesn't care about the current
|
||
* amount of entropy. */
|
||
have_syscall = true;
|
||
else
|
||
return -errno;
|
||
} else
|
||
/* too short read? */
|
||
return -EIO;
|
||
}
|
||
|
||
fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0)
|
||
return errno == ENOENT ? -ENOSYS : -errno;
|
||
|
||
k = loop_read(fd, p, n, true);
|
||
safe_close(fd);
|
||
|
||
if (k < 0)
|
||
return (int) k;
|
||
if ((size_t) k != n)
|
||
return -EIO;
|
||
|
||
return 0;
|
||
}
|
||
|
||
void initialize_srand(void) {
|
||
static bool srand_called = false;
|
||
unsigned x;
|
||
#ifdef HAVE_SYS_AUXV_H
|
||
void *auxv;
|
||
#endif
|
||
|
||
if (srand_called)
|
||
return;
|
||
|
||
x = 0;
|
||
|
||
#ifdef HAVE_SYS_AUXV_H
|
||
/* The kernel provides us with a bit of entropy in auxv, so
|
||
* let's try to make use of that to seed the pseudo-random
|
||
* generator. It's better than nothing... */
|
||
|
||
auxv = (void*) getauxval(AT_RANDOM);
|
||
if (auxv)
|
||
x ^= *(unsigned*) auxv;
|
||
#endif
|
||
|
||
x ^= (unsigned) now(CLOCK_REALTIME);
|
||
x ^= (unsigned) gettid();
|
||
|
||
srand(x);
|
||
srand_called = true;
|
||
}
|
||
|
||
void random_bytes(void *p, size_t n) {
|
||
uint8_t *q;
|
||
int r;
|
||
|
||
r = dev_urandom(p, n);
|
||
if (r >= 0)
|
||
return;
|
||
|
||
/* If some idiot made /dev/urandom unavailable to us, he'll
|
||
* get a PRNG instead. */
|
||
|
||
initialize_srand();
|
||
|
||
for (q = p; q < (uint8_t*) p + n; q ++)
|
||
*q = rand();
|
||
}
|
||
|
||
void rename_process(const char name[8]) {
|
||
assert(name);
|
||
|
||
/* This is a like a poor man's setproctitle(). It changes the
|
||
* comm field, argv[0], and also the glibc's internally used
|
||
* name of the process. For the first one a limit of 16 chars
|
||
* applies, to the second one usually one of 10 (i.e. length
|
||
* of "/sbin/init"), to the third one one of 7 (i.e. length of
|
||
* "systemd"). If you pass a longer string it will be
|
||
* truncated */
|
||
|
||
prctl(PR_SET_NAME, name);
|
||
|
||
if (program_invocation_name)
|
||
strncpy(program_invocation_name, name, strlen(program_invocation_name));
|
||
|
||
if (saved_argc > 0) {
|
||
int i;
|
||
|
||
if (saved_argv[0])
|
||
strncpy(saved_argv[0], name, strlen(saved_argv[0]));
|
||
|
||
for (i = 1; i < saved_argc; i++) {
|
||
if (!saved_argv[i])
|
||
break;
|
||
|
||
memzero(saved_argv[i], strlen(saved_argv[i]));
|
||
}
|
||
}
|
||
}
|
||
|
||
void sigset_add_many(sigset_t *ss, ...) {
|
||
va_list ap;
|
||
int sig;
|
||
|
||
assert(ss);
|
||
|
||
va_start(ap, ss);
|
||
while ((sig = va_arg(ap, int)) > 0)
|
||
assert_se(sigaddset(ss, sig) == 0);
|
||
va_end(ap);
|
||
}
|
||
|
||
int sigprocmask_many(int how, ...) {
|
||
va_list ap;
|
||
sigset_t ss;
|
||
int sig;
|
||
|
||
assert_se(sigemptyset(&ss) == 0);
|
||
|
||
va_start(ap, how);
|
||
while ((sig = va_arg(ap, int)) > 0)
|
||
assert_se(sigaddset(&ss, sig) == 0);
|
||
va_end(ap);
|
||
|
||
if (sigprocmask(how, &ss, NULL) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
char* gethostname_malloc(void) {
|
||
struct utsname u;
|
||
|
||
assert_se(uname(&u) >= 0);
|
||
|
||
if (!isempty(u.nodename) && !streq(u.nodename, "(none)"))
|
||
return strdup(u.nodename);
|
||
|
||
return strdup(u.sysname);
|
||
}
|
||
|
||
bool hostname_is_set(void) {
|
||
struct utsname u;
|
||
|
||
assert_se(uname(&u) >= 0);
|
||
|
||
return !isempty(u.nodename) && !streq(u.nodename, "(none)");
|
||
}
|
||
|
||
char *lookup_uid(uid_t uid) {
|
||
long bufsize;
|
||
char *name;
|
||
_cleanup_free_ char *buf = NULL;
|
||
struct passwd pwbuf, *pw = NULL;
|
||
|
||
/* Shortcut things to avoid NSS lookups */
|
||
if (uid == 0)
|
||
return strdup("root");
|
||
|
||
bufsize = sysconf(_SC_GETPW_R_SIZE_MAX);
|
||
if (bufsize <= 0)
|
||
bufsize = 4096;
|
||
|
||
buf = malloc(bufsize);
|
||
if (!buf)
|
||
return NULL;
|
||
|
||
if (getpwuid_r(uid, &pwbuf, buf, bufsize, &pw) == 0 && pw)
|
||
return strdup(pw->pw_name);
|
||
|
||
if (asprintf(&name, UID_FMT, uid) < 0)
|
||
return NULL;
|
||
|
||
return name;
|
||
}
|
||
|
||
char* getlogname_malloc(void) {
|
||
uid_t uid;
|
||
struct stat st;
|
||
|
||
if (isatty(STDIN_FILENO) && fstat(STDIN_FILENO, &st) >= 0)
|
||
uid = st.st_uid;
|
||
else
|
||
uid = getuid();
|
||
|
||
return lookup_uid(uid);
|
||
}
|
||
|
||
char *getusername_malloc(void) {
|
||
const char *e;
|
||
|
||
e = getenv("USER");
|
||
if (e)
|
||
return strdup(e);
|
||
|
||
return lookup_uid(getuid());
|
||
}
|
||
|
||
int getttyname_malloc(int fd, char **r) {
|
||
char path[PATH_MAX], *c;
|
||
int k;
|
||
|
||
assert(r);
|
||
|
||
k = ttyname_r(fd, path, sizeof(path));
|
||
if (k > 0)
|
||
return -k;
|
||
|
||
char_array_0(path);
|
||
|
||
c = strdup(startswith(path, "/dev/") ? path + 5 : path);
|
||
if (!c)
|
||
return -ENOMEM;
|
||
|
||
*r = c;
|
||
return 0;
|
||
}
|
||
|
||
int getttyname_harder(int fd, char **r) {
|
||
int k;
|
||
char *s;
|
||
|
||
k = getttyname_malloc(fd, &s);
|
||
if (k < 0)
|
||
return k;
|
||
|
||
if (streq(s, "tty")) {
|
||
free(s);
|
||
return get_ctty(0, NULL, r);
|
||
}
|
||
|
||
*r = s;
|
||
return 0;
|
||
}
|
||
|
||
int get_ctty_devnr(pid_t pid, dev_t *d) {
|
||
int r;
|
||
_cleanup_free_ char *line = NULL;
|
||
const char *p;
|
||
unsigned long ttynr;
|
||
|
||
assert(pid >= 0);
|
||
|
||
p = procfs_file_alloca(pid, "stat");
|
||
r = read_one_line_file(p, &line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
p = strrchr(line, ')');
|
||
if (!p)
|
||
return -EIO;
|
||
|
||
p++;
|
||
|
||
if (sscanf(p, " "
|
||
"%*c " /* state */
|
||
"%*d " /* ppid */
|
||
"%*d " /* pgrp */
|
||
"%*d " /* session */
|
||
"%lu ", /* ttynr */
|
||
&ttynr) != 1)
|
||
return -EIO;
|
||
|
||
if (major(ttynr) == 0 && minor(ttynr) == 0)
|
||
return -ENOENT;
|
||
|
||
if (d)
|
||
*d = (dev_t) ttynr;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_ctty(pid_t pid, dev_t *_devnr, char **r) {
|
||
char fn[sizeof("/dev/char/")-1 + 2*DECIMAL_STR_MAX(unsigned) + 1 + 1], *b = NULL;
|
||
_cleanup_free_ char *s = NULL;
|
||
const char *p;
|
||
dev_t devnr;
|
||
int k;
|
||
|
||
assert(r);
|
||
|
||
k = get_ctty_devnr(pid, &devnr);
|
||
if (k < 0)
|
||
return k;
|
||
|
||
snprintf(fn, sizeof(fn), "/dev/char/%u:%u", major(devnr), minor(devnr));
|
||
|
||
k = readlink_malloc(fn, &s);
|
||
if (k < 0) {
|
||
|
||
if (k != -ENOENT)
|
||
return k;
|
||
|
||
/* This is an ugly hack */
|
||
if (major(devnr) == 136) {
|
||
asprintf(&b, "pts/%u", minor(devnr));
|
||
goto finish;
|
||
}
|
||
|
||
/* Probably something like the ptys which have no
|
||
* symlink in /dev/char. Let's return something
|
||
* vaguely useful. */
|
||
|
||
b = strdup(fn + 5);
|
||
goto finish;
|
||
}
|
||
|
||
if (startswith(s, "/dev/"))
|
||
p = s + 5;
|
||
else if (startswith(s, "../"))
|
||
p = s + 3;
|
||
else
|
||
p = s;
|
||
|
||
b = strdup(p);
|
||
|
||
finish:
|
||
if (!b)
|
||
return -ENOMEM;
|
||
|
||
*r = b;
|
||
if (_devnr)
|
||
*_devnr = devnr;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int rm_rf_children_dangerous(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
int ret = 0;
|
||
|
||
assert(fd >= 0);
|
||
|
||
/* This returns the first error we run into, but nevertheless
|
||
* tries to go on. This closes the passed fd. */
|
||
|
||
d = fdopendir(fd);
|
||
if (!d) {
|
||
safe_close(fd);
|
||
|
||
return errno == ENOENT ? 0 : -errno;
|
||
}
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
bool is_dir, keep_around;
|
||
struct stat st;
|
||
int r;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de) {
|
||
if (errno != 0 && ret == 0)
|
||
ret = -errno;
|
||
return ret;
|
||
}
|
||
|
||
if (streq(de->d_name, ".") || streq(de->d_name, ".."))
|
||
continue;
|
||
|
||
if (de->d_type == DT_UNKNOWN ||
|
||
honour_sticky ||
|
||
(de->d_type == DT_DIR && root_dev)) {
|
||
if (fstatat(fd, de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0) {
|
||
if (ret == 0 && errno != ENOENT)
|
||
ret = -errno;
|
||
continue;
|
||
}
|
||
|
||
is_dir = S_ISDIR(st.st_mode);
|
||
keep_around =
|
||
honour_sticky &&
|
||
(st.st_uid == 0 || st.st_uid == getuid()) &&
|
||
(st.st_mode & S_ISVTX);
|
||
} else {
|
||
is_dir = de->d_type == DT_DIR;
|
||
keep_around = false;
|
||
}
|
||
|
||
if (is_dir) {
|
||
int subdir_fd;
|
||
|
||
/* if root_dev is set, remove subdirectories only, if device is same as dir */
|
||
if (root_dev && st.st_dev != root_dev->st_dev)
|
||
continue;
|
||
|
||
subdir_fd = openat(fd, de->d_name,
|
||
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
|
||
if (subdir_fd < 0) {
|
||
if (ret == 0 && errno != ENOENT)
|
||
ret = -errno;
|
||
continue;
|
||
}
|
||
|
||
r = rm_rf_children_dangerous(subdir_fd, only_dirs, honour_sticky, root_dev);
|
||
if (r < 0 && ret == 0)
|
||
ret = r;
|
||
|
||
if (!keep_around)
|
||
if (unlinkat(fd, de->d_name, AT_REMOVEDIR) < 0) {
|
||
if (ret == 0 && errno != ENOENT)
|
||
ret = -errno;
|
||
}
|
||
|
||
} else if (!only_dirs && !keep_around) {
|
||
|
||
if (unlinkat(fd, de->d_name, 0) < 0) {
|
||
if (ret == 0 && errno != ENOENT)
|
||
ret = -errno;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
_pure_ static int is_temporary_fs(struct statfs *s) {
|
||
assert(s);
|
||
|
||
return F_TYPE_EQUAL(s->f_type, TMPFS_MAGIC) ||
|
||
F_TYPE_EQUAL(s->f_type, RAMFS_MAGIC);
|
||
}
|
||
|
||
int rm_rf_children(int fd, bool only_dirs, bool honour_sticky, struct stat *root_dev) {
|
||
struct statfs s;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (fstatfs(fd, &s) < 0) {
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
/* We refuse to clean disk file systems with this call. This
|
||
* is extra paranoia just to be sure we never ever remove
|
||
* non-state data */
|
||
if (!is_temporary_fs(&s)) {
|
||
log_error("Attempted to remove disk file system, and we can't allow that.");
|
||
safe_close(fd);
|
||
return -EPERM;
|
||
}
|
||
|
||
return rm_rf_children_dangerous(fd, only_dirs, honour_sticky, root_dev);
|
||
}
|
||
|
||
static int rm_rf_internal(const char *path, bool only_dirs, bool delete_root, bool honour_sticky, bool dangerous) {
|
||
int fd, r;
|
||
struct statfs s;
|
||
|
||
assert(path);
|
||
|
||
/* We refuse to clean the root file system with this
|
||
* call. This is extra paranoia to never cause a really
|
||
* seriously broken system. */
|
||
if (path_equal(path, "/")) {
|
||
log_error("Attempted to remove entire root file system, and we can't allow that.");
|
||
return -EPERM;
|
||
}
|
||
|
||
fd = open(path, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW|O_NOATIME);
|
||
if (fd < 0) {
|
||
|
||
if (errno != ENOTDIR)
|
||
return -errno;
|
||
|
||
if (!dangerous) {
|
||
if (statfs(path, &s) < 0)
|
||
return -errno;
|
||
|
||
if (!is_temporary_fs(&s)) {
|
||
log_error("Attempted to remove disk file system, and we can't allow that.");
|
||
return -EPERM;
|
||
}
|
||
}
|
||
|
||
if (delete_root && !only_dirs)
|
||
if (unlink(path) < 0 && errno != ENOENT)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
if (!dangerous) {
|
||
if (fstatfs(fd, &s) < 0) {
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
if (!is_temporary_fs(&s)) {
|
||
log_error("Attempted to remove disk file system, and we can't allow that.");
|
||
safe_close(fd);
|
||
return -EPERM;
|
||
}
|
||
}
|
||
|
||
r = rm_rf_children_dangerous(fd, only_dirs, honour_sticky, NULL);
|
||
if (delete_root) {
|
||
|
||
if (honour_sticky && file_is_priv_sticky(path) > 0)
|
||
return r;
|
||
|
||
if (rmdir(path) < 0 && errno != ENOENT) {
|
||
if (r == 0)
|
||
r = -errno;
|
||
}
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
int rm_rf(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
|
||
return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, false);
|
||
}
|
||
|
||
int rm_rf_dangerous(const char *path, bool only_dirs, bool delete_root, bool honour_sticky) {
|
||
return rm_rf_internal(path, only_dirs, delete_root, honour_sticky, true);
|
||
}
|
||
|
||
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
|
||
assert(path);
|
||
|
||
/* Under the assumption that we are running privileged we
|
||
* first change the access mode and only then hand out
|
||
* ownership to avoid a window where access is too open. */
|
||
|
||
if (mode != (mode_t) -1)
|
||
if (chmod(path, mode) < 0)
|
||
return -errno;
|
||
|
||
if (uid != (uid_t) -1 || gid != (gid_t) -1)
|
||
if (chown(path, uid, gid) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
|
||
assert(fd >= 0);
|
||
|
||
/* Under the assumption that we are running privileged we
|
||
* first change the access mode and only then hand out
|
||
* ownership to avoid a window where access is too open. */
|
||
|
||
if (mode != (mode_t) -1)
|
||
if (fchmod(fd, mode) < 0)
|
||
return -errno;
|
||
|
||
if (uid != (uid_t) -1 || gid != (gid_t) -1)
|
||
if (fchown(fd, uid, gid) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
cpu_set_t* cpu_set_malloc(unsigned *ncpus) {
|
||
cpu_set_t *r;
|
||
unsigned n = 1024;
|
||
|
||
/* Allocates the cpuset in the right size */
|
||
|
||
for (;;) {
|
||
if (!(r = CPU_ALLOC(n)))
|
||
return NULL;
|
||
|
||
if (sched_getaffinity(0, CPU_ALLOC_SIZE(n), r) >= 0) {
|
||
CPU_ZERO_S(CPU_ALLOC_SIZE(n), r);
|
||
|
||
if (ncpus)
|
||
*ncpus = n;
|
||
|
||
return r;
|
||
}
|
||
|
||
CPU_FREE(r);
|
||
|
||
if (errno != EINVAL)
|
||
return NULL;
|
||
|
||
n *= 2;
|
||
}
|
||
}
|
||
|
||
int status_vprintf(const char *status, bool ellipse, bool ephemeral, const char *format, va_list ap) {
|
||
static const char status_indent[] = " "; /* "[" STATUS "] " */
|
||
_cleanup_free_ char *s = NULL;
|
||
_cleanup_close_ int fd = -1;
|
||
struct iovec iovec[6] = {};
|
||
int n = 0;
|
||
static bool prev_ephemeral;
|
||
|
||
assert(format);
|
||
|
||
/* This is independent of logging, as status messages are
|
||
* optional and go exclusively to the console. */
|
||
|
||
if (vasprintf(&s, format, ap) < 0)
|
||
return log_oom();
|
||
|
||
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
if (ellipse) {
|
||
char *e;
|
||
size_t emax, sl;
|
||
int c;
|
||
|
||
c = fd_columns(fd);
|
||
if (c <= 0)
|
||
c = 80;
|
||
|
||
sl = status ? sizeof(status_indent)-1 : 0;
|
||
|
||
emax = c - sl - 1;
|
||
if (emax < 3)
|
||
emax = 3;
|
||
|
||
e = ellipsize(s, emax, 50);
|
||
if (e) {
|
||
free(s);
|
||
s = e;
|
||
}
|
||
}
|
||
|
||
if (prev_ephemeral)
|
||
IOVEC_SET_STRING(iovec[n++], "\r" ANSI_ERASE_TO_END_OF_LINE);
|
||
prev_ephemeral = ephemeral;
|
||
|
||
if (status) {
|
||
if (!isempty(status)) {
|
||
IOVEC_SET_STRING(iovec[n++], "[");
|
||
IOVEC_SET_STRING(iovec[n++], status);
|
||
IOVEC_SET_STRING(iovec[n++], "] ");
|
||
} else
|
||
IOVEC_SET_STRING(iovec[n++], status_indent);
|
||
}
|
||
|
||
IOVEC_SET_STRING(iovec[n++], s);
|
||
if (!ephemeral)
|
||
IOVEC_SET_STRING(iovec[n++], "\n");
|
||
|
||
if (writev(fd, iovec, n) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int status_printf(const char *status, bool ellipse, bool ephemeral, const char *format, ...) {
|
||
va_list ap;
|
||
int r;
|
||
|
||
assert(format);
|
||
|
||
va_start(ap, format);
|
||
r = status_vprintf(status, ellipse, ephemeral, format, ap);
|
||
va_end(ap);
|
||
|
||
return r;
|
||
}
|
||
|
||
char *replace_env(const char *format, char **env) {
|
||
enum {
|
||
WORD,
|
||
CURLY,
|
||
VARIABLE
|
||
} state = WORD;
|
||
|
||
const char *e, *word = format;
|
||
char *r = NULL, *k;
|
||
|
||
assert(format);
|
||
|
||
for (e = format; *e; e ++) {
|
||
|
||
switch (state) {
|
||
|
||
case WORD:
|
||
if (*e == '$')
|
||
state = CURLY;
|
||
break;
|
||
|
||
case CURLY:
|
||
if (*e == '{') {
|
||
if (!(k = strnappend(r, word, e-word-1)))
|
||
goto fail;
|
||
|
||
free(r);
|
||
r = k;
|
||
|
||
word = e-1;
|
||
state = VARIABLE;
|
||
|
||
} else if (*e == '$') {
|
||
if (!(k = strnappend(r, word, e-word)))
|
||
goto fail;
|
||
|
||
free(r);
|
||
r = k;
|
||
|
||
word = e+1;
|
||
state = WORD;
|
||
} else
|
||
state = WORD;
|
||
break;
|
||
|
||
case VARIABLE:
|
||
if (*e == '}') {
|
||
const char *t;
|
||
|
||
t = strempty(strv_env_get_n(env, word+2, e-word-2));
|
||
|
||
k = strappend(r, t);
|
||
if (!k)
|
||
goto fail;
|
||
|
||
free(r);
|
||
r = k;
|
||
|
||
word = e+1;
|
||
state = WORD;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (!(k = strnappend(r, word, e-word)))
|
||
goto fail;
|
||
|
||
free(r);
|
||
return k;
|
||
|
||
fail:
|
||
free(r);
|
||
return NULL;
|
||
}
|
||
|
||
char **replace_env_argv(char **argv, char **env) {
|
||
char **ret, **i;
|
||
unsigned k = 0, l = 0;
|
||
|
||
l = strv_length(argv);
|
||
|
||
ret = new(char*, l+1);
|
||
if (!ret)
|
||
return NULL;
|
||
|
||
STRV_FOREACH(i, argv) {
|
||
|
||
/* If $FOO appears as single word, replace it by the split up variable */
|
||
if ((*i)[0] == '$' && (*i)[1] != '{') {
|
||
char *e;
|
||
char **w, **m;
|
||
unsigned q;
|
||
|
||
e = strv_env_get(env, *i+1);
|
||
if (e) {
|
||
int r;
|
||
|
||
r = strv_split_quoted(&m, e);
|
||
if (r < 0) {
|
||
ret[k] = NULL;
|
||
strv_free(ret);
|
||
return NULL;
|
||
}
|
||
} else
|
||
m = NULL;
|
||
|
||
q = strv_length(m);
|
||
l = l + q - 1;
|
||
|
||
w = realloc(ret, sizeof(char*) * (l+1));
|
||
if (!w) {
|
||
ret[k] = NULL;
|
||
strv_free(ret);
|
||
strv_free(m);
|
||
return NULL;
|
||
}
|
||
|
||
ret = w;
|
||
if (m) {
|
||
memcpy(ret + k, m, q * sizeof(char*));
|
||
free(m);
|
||
}
|
||
|
||
k += q;
|
||
continue;
|
||
}
|
||
|
||
/* If ${FOO} appears as part of a word, replace it by the variable as-is */
|
||
ret[k] = replace_env(*i, env);
|
||
if (!ret[k]) {
|
||
strv_free(ret);
|
||
return NULL;
|
||
}
|
||
k++;
|
||
}
|
||
|
||
ret[k] = NULL;
|
||
return ret;
|
||
}
|
||
|
||
int fd_columns(int fd) {
|
||
struct winsize ws = {};
|
||
|
||
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
||
return -errno;
|
||
|
||
if (ws.ws_col <= 0)
|
||
return -EIO;
|
||
|
||
return ws.ws_col;
|
||
}
|
||
|
||
unsigned columns(void) {
|
||
const char *e;
|
||
int c;
|
||
|
||
if (_likely_(cached_columns > 0))
|
||
return cached_columns;
|
||
|
||
c = 0;
|
||
e = getenv("COLUMNS");
|
||
if (e)
|
||
(void) safe_atoi(e, &c);
|
||
|
||
if (c <= 0)
|
||
c = fd_columns(STDOUT_FILENO);
|
||
|
||
if (c <= 0)
|
||
c = 80;
|
||
|
||
cached_columns = c;
|
||
return c;
|
||
}
|
||
|
||
int fd_lines(int fd) {
|
||
struct winsize ws = {};
|
||
|
||
if (ioctl(fd, TIOCGWINSZ, &ws) < 0)
|
||
return -errno;
|
||
|
||
if (ws.ws_row <= 0)
|
||
return -EIO;
|
||
|
||
return ws.ws_row;
|
||
}
|
||
|
||
unsigned lines(void) {
|
||
const char *e;
|
||
unsigned l;
|
||
|
||
if (_likely_(cached_lines > 0))
|
||
return cached_lines;
|
||
|
||
l = 0;
|
||
e = getenv("LINES");
|
||
if (e)
|
||
(void) safe_atou(e, &l);
|
||
|
||
if (l <= 0)
|
||
l = fd_lines(STDOUT_FILENO);
|
||
|
||
if (l <= 0)
|
||
l = 24;
|
||
|
||
cached_lines = l;
|
||
return cached_lines;
|
||
}
|
||
|
||
/* intended to be used as a SIGWINCH sighandler */
|
||
void columns_lines_cache_reset(int signum) {
|
||
cached_columns = 0;
|
||
cached_lines = 0;
|
||
}
|
||
|
||
bool on_tty(void) {
|
||
static int cached_on_tty = -1;
|
||
|
||
if (_unlikely_(cached_on_tty < 0))
|
||
cached_on_tty = isatty(STDOUT_FILENO) > 0;
|
||
|
||
return cached_on_tty;
|
||
}
|
||
|
||
int files_same(const char *filea, const char *fileb) {
|
||
struct stat a, b;
|
||
|
||
if (stat(filea, &a) < 0)
|
||
return -errno;
|
||
|
||
if (stat(fileb, &b) < 0)
|
||
return -errno;
|
||
|
||
return a.st_dev == b.st_dev &&
|
||
a.st_ino == b.st_ino;
|
||
}
|
||
|
||
int running_in_chroot(void) {
|
||
int ret;
|
||
|
||
ret = files_same("/proc/1/root", "/");
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
return ret == 0;
|
||
}
|
||
|
||
static char *ascii_ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
|
||
size_t x;
|
||
char *r;
|
||
|
||
assert(s);
|
||
assert(percent <= 100);
|
||
assert(new_length >= 3);
|
||
|
||
if (old_length <= 3 || old_length <= new_length)
|
||
return strndup(s, old_length);
|
||
|
||
r = new0(char, new_length+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
x = (new_length * percent) / 100;
|
||
|
||
if (x > new_length - 3)
|
||
x = new_length - 3;
|
||
|
||
memcpy(r, s, x);
|
||
r[x] = '.';
|
||
r[x+1] = '.';
|
||
r[x+2] = '.';
|
||
memcpy(r + x + 3,
|
||
s + old_length - (new_length - x - 3),
|
||
new_length - x - 3);
|
||
|
||
return r;
|
||
}
|
||
|
||
char *ellipsize_mem(const char *s, size_t old_length, size_t new_length, unsigned percent) {
|
||
size_t x;
|
||
char *e;
|
||
const char *i, *j;
|
||
unsigned k, len, len2;
|
||
|
||
assert(s);
|
||
assert(percent <= 100);
|
||
assert(new_length >= 3);
|
||
|
||
/* if no multibyte characters use ascii_ellipsize_mem for speed */
|
||
if (ascii_is_valid(s))
|
||
return ascii_ellipsize_mem(s, old_length, new_length, percent);
|
||
|
||
if (old_length <= 3 || old_length <= new_length)
|
||
return strndup(s, old_length);
|
||
|
||
x = (new_length * percent) / 100;
|
||
|
||
if (x > new_length - 3)
|
||
x = new_length - 3;
|
||
|
||
k = 0;
|
||
for (i = s; k < x && i < s + old_length; i = utf8_next_char(i)) {
|
||
int c;
|
||
|
||
c = utf8_encoded_to_unichar(i);
|
||
if (c < 0)
|
||
return NULL;
|
||
k += unichar_iswide(c) ? 2 : 1;
|
||
}
|
||
|
||
if (k > x) /* last character was wide and went over quota */
|
||
x ++;
|
||
|
||
for (j = s + old_length; k < new_length && j > i; ) {
|
||
int c;
|
||
|
||
j = utf8_prev_char(j);
|
||
c = utf8_encoded_to_unichar(j);
|
||
if (c < 0)
|
||
return NULL;
|
||
k += unichar_iswide(c) ? 2 : 1;
|
||
}
|
||
assert(i <= j);
|
||
|
||
/* we don't actually need to ellipsize */
|
||
if (i == j)
|
||
return memdup(s, old_length + 1);
|
||
|
||
/* make space for ellipsis */
|
||
j = utf8_next_char(j);
|
||
|
||
len = i - s;
|
||
len2 = s + old_length - j;
|
||
e = new(char, len + 3 + len2 + 1);
|
||
if (!e)
|
||
return NULL;
|
||
|
||
/*
|
||
printf("old_length=%zu new_length=%zu x=%zu len=%u len2=%u k=%u\n",
|
||
old_length, new_length, x, len, len2, k);
|
||
*/
|
||
|
||
memcpy(e, s, len);
|
||
e[len] = 0xe2; /* tri-dot ellipsis: … */
|
||
e[len + 1] = 0x80;
|
||
e[len + 2] = 0xa6;
|
||
|
||
memcpy(e + len + 3, j, len2 + 1);
|
||
|
||
return e;
|
||
}
|
||
|
||
char *ellipsize(const char *s, size_t length, unsigned percent) {
|
||
return ellipsize_mem(s, strlen(s), length, percent);
|
||
}
|
||
|
||
int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) {
|
||
_cleanup_close_ int fd;
|
||
int r;
|
||
|
||
assert(path);
|
||
|
||
if (parents)
|
||
mkdir_parents(path, 0755);
|
||
|
||
fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode > 0 ? mode : 0644);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
if (mode > 0) {
|
||
r = fchmod(fd, mode);
|
||
if (r < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (uid != (uid_t) -1 || gid != (gid_t) -1) {
|
||
r = fchown(fd, uid, gid);
|
||
if (r < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (stamp != USEC_INFINITY) {
|
||
struct timespec ts[2];
|
||
|
||
timespec_store(&ts[0], stamp);
|
||
ts[1] = ts[0];
|
||
r = futimens(fd, ts);
|
||
} else
|
||
r = futimens(fd, NULL);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int touch(const char *path) {
|
||
return touch_file(path, false, USEC_INFINITY, (uid_t) -1, (gid_t) -1, 0);
|
||
}
|
||
|
||
char *unquote(const char *s, const char* quotes) {
|
||
size_t l;
|
||
assert(s);
|
||
|
||
/* This is rather stupid, simply removes the heading and
|
||
* trailing quotes if there is one. Doesn't care about
|
||
* escaping or anything. We should make this smarter one
|
||
* day...*/
|
||
|
||
l = strlen(s);
|
||
if (l < 2)
|
||
return strdup(s);
|
||
|
||
if (strchr(quotes, s[0]) && s[l-1] == s[0])
|
||
return strndup(s+1, l-2);
|
||
|
||
return strdup(s);
|
||
}
|
||
|
||
char *normalize_env_assignment(const char *s) {
|
||
_cleanup_free_ char *name = NULL, *value = NULL, *p = NULL;
|
||
char *eq, *r;
|
||
|
||
eq = strchr(s, '=');
|
||
if (!eq) {
|
||
char *t;
|
||
|
||
r = strdup(s);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
t = strstrip(r);
|
||
if (t == r)
|
||
return r;
|
||
|
||
memmove(r, t, strlen(t) + 1);
|
||
return r;
|
||
}
|
||
|
||
name = strndup(s, eq - s);
|
||
if (!name)
|
||
return NULL;
|
||
|
||
p = strdup(eq + 1);
|
||
if (!p)
|
||
return NULL;
|
||
|
||
value = unquote(strstrip(p), QUOTES);
|
||
if (!value)
|
||
return NULL;
|
||
|
||
if (asprintf(&r, "%s=%s", strstrip(name), value) < 0)
|
||
r = NULL;
|
||
|
||
return r;
|
||
}
|
||
|
||
int wait_for_terminate(pid_t pid, siginfo_t *status) {
|
||
siginfo_t dummy;
|
||
|
||
assert(pid >= 1);
|
||
|
||
if (!status)
|
||
status = &dummy;
|
||
|
||
for (;;) {
|
||
zero(*status);
|
||
|
||
if (waitid(P_PID, pid, status, WEXITED) < 0) {
|
||
|
||
if (errno == EINTR)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/*
|
||
* Return values:
|
||
* < 0 : wait_for_terminate() failed to get the state of the
|
||
* process, the process was terminated by a signal, or
|
||
* failed for an unknown reason.
|
||
* >=0 : The process terminated normally, and its exit code is
|
||
* returned.
|
||
*
|
||
* That is, success is indicated by a return value of zero, and an
|
||
* error is indicated by a non-zero value.
|
||
*/
|
||
int wait_for_terminate_and_warn(const char *name, pid_t pid) {
|
||
int r;
|
||
siginfo_t status;
|
||
|
||
assert(name);
|
||
assert(pid > 1);
|
||
|
||
r = wait_for_terminate(pid, &status);
|
||
if (r < 0) {
|
||
log_warning("Failed to wait for %s: %s", name, strerror(-r));
|
||
return r;
|
||
}
|
||
|
||
if (status.si_code == CLD_EXITED) {
|
||
if (status.si_status != 0) {
|
||
log_warning("%s failed with error code %i.", name, status.si_status);
|
||
return status.si_status;
|
||
}
|
||
|
||
log_debug("%s succeeded.", name);
|
||
return 0;
|
||
|
||
} else if (status.si_code == CLD_KILLED ||
|
||
status.si_code == CLD_DUMPED) {
|
||
|
||
log_warning("%s terminated by signal %s.", name, signal_to_string(status.si_status));
|
||
return -EPROTO;
|
||
}
|
||
|
||
log_warning("%s failed due to unknown reason.", name);
|
||
return -EPROTO;
|
||
}
|
||
|
||
noreturn void freeze(void) {
|
||
|
||
/* Make sure nobody waits for us on a socket anymore */
|
||
close_all_fds(NULL, 0);
|
||
|
||
sync();
|
||
|
||
for (;;)
|
||
pause();
|
||
}
|
||
|
||
bool null_or_empty(struct stat *st) {
|
||
assert(st);
|
||
|
||
if (S_ISREG(st->st_mode) && st->st_size <= 0)
|
||
return true;
|
||
|
||
if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
int null_or_empty_path(const char *fn) {
|
||
struct stat st;
|
||
|
||
assert(fn);
|
||
|
||
if (stat(fn, &st) < 0)
|
||
return -errno;
|
||
|
||
return null_or_empty(&st);
|
||
}
|
||
|
||
int null_or_empty_fd(int fd) {
|
||
struct stat st;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
return null_or_empty(&st);
|
||
}
|
||
|
||
DIR *xopendirat(int fd, const char *name, int flags) {
|
||
int nfd;
|
||
DIR *d;
|
||
|
||
assert(!(flags & O_CREAT));
|
||
|
||
nfd = openat(fd, name, O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC|flags, 0);
|
||
if (nfd < 0)
|
||
return NULL;
|
||
|
||
d = fdopendir(nfd);
|
||
if (!d) {
|
||
safe_close(nfd);
|
||
return NULL;
|
||
}
|
||
|
||
return d;
|
||
}
|
||
|
||
int signal_from_string_try_harder(const char *s) {
|
||
int signo;
|
||
assert(s);
|
||
|
||
signo = signal_from_string(s);
|
||
if (signo <= 0)
|
||
if (startswith(s, "SIG"))
|
||
return signal_from_string(s+3);
|
||
|
||
return signo;
|
||
}
|
||
|
||
static char *tag_to_udev_node(const char *tagvalue, const char *by) {
|
||
_cleanup_free_ char *t = NULL, *u = NULL;
|
||
size_t enc_len;
|
||
|
||
u = unquote(tagvalue, "\"\'");
|
||
if (!u)
|
||
return NULL;
|
||
|
||
enc_len = strlen(u) * 4 + 1;
|
||
t = new(char, enc_len);
|
||
if (!t)
|
||
return NULL;
|
||
|
||
if (encode_devnode_name(u, t, enc_len) < 0)
|
||
return NULL;
|
||
|
||
return strjoin("/dev/disk/by-", by, "/", t, NULL);
|
||
}
|
||
|
||
char *fstab_node_to_udev_node(const char *p) {
|
||
assert(p);
|
||
|
||
if (startswith(p, "LABEL="))
|
||
return tag_to_udev_node(p+6, "label");
|
||
|
||
if (startswith(p, "UUID="))
|
||
return tag_to_udev_node(p+5, "uuid");
|
||
|
||
if (startswith(p, "PARTUUID="))
|
||
return tag_to_udev_node(p+9, "partuuid");
|
||
|
||
if (startswith(p, "PARTLABEL="))
|
||
return tag_to_udev_node(p+10, "partlabel");
|
||
|
||
return strdup(p);
|
||
}
|
||
|
||
bool tty_is_vc(const char *tty) {
|
||
assert(tty);
|
||
|
||
return vtnr_from_tty(tty) >= 0;
|
||
}
|
||
|
||
bool tty_is_console(const char *tty) {
|
||
assert(tty);
|
||
|
||
if (startswith(tty, "/dev/"))
|
||
tty += 5;
|
||
|
||
return streq(tty, "console");
|
||
}
|
||
|
||
int vtnr_from_tty(const char *tty) {
|
||
int i, r;
|
||
|
||
assert(tty);
|
||
|
||
if (startswith(tty, "/dev/"))
|
||
tty += 5;
|
||
|
||
if (!startswith(tty, "tty") )
|
||
return -EINVAL;
|
||
|
||
if (tty[3] < '0' || tty[3] > '9')
|
||
return -EINVAL;
|
||
|
||
r = safe_atoi(tty+3, &i);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (i < 0 || i > 63)
|
||
return -EINVAL;
|
||
|
||
return i;
|
||
}
|
||
|
||
char *resolve_dev_console(char **active) {
|
||
char *tty;
|
||
|
||
/* Resolve where /dev/console is pointing to, if /sys is actually ours
|
||
* (i.e. not read-only-mounted which is a sign for container setups) */
|
||
|
||
if (path_is_read_only_fs("/sys") > 0)
|
||
return NULL;
|
||
|
||
if (read_one_line_file("/sys/class/tty/console/active", active) < 0)
|
||
return NULL;
|
||
|
||
/* If multiple log outputs are configured the last one is what
|
||
* /dev/console points to */
|
||
tty = strrchr(*active, ' ');
|
||
if (tty)
|
||
tty++;
|
||
else
|
||
tty = *active;
|
||
|
||
if (streq(tty, "tty0")) {
|
||
char *tmp;
|
||
|
||
/* Get the active VC (e.g. tty1) */
|
||
if (read_one_line_file("/sys/class/tty/tty0/active", &tmp) >= 0) {
|
||
free(*active);
|
||
tty = *active = tmp;
|
||
}
|
||
}
|
||
|
||
return tty;
|
||
}
|
||
|
||
bool tty_is_vc_resolve(const char *tty) {
|
||
_cleanup_free_ char *active = NULL;
|
||
|
||
assert(tty);
|
||
|
||
if (startswith(tty, "/dev/"))
|
||
tty += 5;
|
||
|
||
if (streq(tty, "console")) {
|
||
tty = resolve_dev_console(&active);
|
||
if (!tty)
|
||
return false;
|
||
}
|
||
|
||
return tty_is_vc(tty);
|
||
}
|
||
|
||
const char *default_term_for_tty(const char *tty) {
|
||
assert(tty);
|
||
|
||
return tty_is_vc_resolve(tty) ? "TERM=linux" : "TERM=vt102";
|
||
}
|
||
|
||
bool dirent_is_file(const struct dirent *de) {
|
||
assert(de);
|
||
|
||
if (ignore_file(de->d_name))
|
||
return false;
|
||
|
||
if (de->d_type != DT_REG &&
|
||
de->d_type != DT_LNK &&
|
||
de->d_type != DT_UNKNOWN)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
|
||
assert(de);
|
||
|
||
if (de->d_type != DT_REG &&
|
||
de->d_type != DT_LNK &&
|
||
de->d_type != DT_UNKNOWN)
|
||
return false;
|
||
|
||
if (ignore_file_allow_backup(de->d_name))
|
||
return false;
|
||
|
||
return endswith(de->d_name, suffix);
|
||
}
|
||
|
||
void execute_directory(const char *directory, DIR *d, usec_t timeout, char *argv[]) {
|
||
pid_t executor_pid;
|
||
int r;
|
||
|
||
assert(directory);
|
||
|
||
/* Executes all binaries in a directory in parallel and waits
|
||
* for them to finish. Optionally a timeout is applied. */
|
||
|
||
executor_pid = fork();
|
||
if (executor_pid < 0) {
|
||
log_error("Failed to fork: %m");
|
||
return;
|
||
|
||
} else if (executor_pid == 0) {
|
||
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
|
||
_cleanup_closedir_ DIR *_d = NULL;
|
||
struct dirent *de;
|
||
|
||
/* We fork this all off from a child process so that
|
||
* we can somewhat cleanly make use of SIGALRM to set
|
||
* a time limit */
|
||
|
||
reset_all_signal_handlers();
|
||
reset_signal_mask();
|
||
|
||
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
|
||
|
||
if (!d) {
|
||
d = _d = opendir(directory);
|
||
if (!d) {
|
||
if (errno == ENOENT)
|
||
_exit(EXIT_SUCCESS);
|
||
|
||
log_error("Failed to enumerate directory %s: %m", directory);
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
}
|
||
|
||
pids = hashmap_new(NULL);
|
||
if (!pids) {
|
||
log_oom();
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
FOREACH_DIRENT(de, d, break) {
|
||
_cleanup_free_ char *path = NULL;
|
||
pid_t pid;
|
||
|
||
if (!dirent_is_file(de))
|
||
continue;
|
||
|
||
path = strjoin(directory, "/", de->d_name, NULL);
|
||
if (!path) {
|
||
log_oom();
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
pid = fork();
|
||
if (pid < 0) {
|
||
log_error("Failed to fork: %m");
|
||
continue;
|
||
} else if (pid == 0) {
|
||
char *_argv[2];
|
||
|
||
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
|
||
|
||
if (!argv) {
|
||
_argv[0] = path;
|
||
_argv[1] = NULL;
|
||
argv = _argv;
|
||
} else
|
||
argv[0] = path;
|
||
|
||
execv(path, argv);
|
||
log_error("Failed to execute %s: %m", path);
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
log_debug("Spawned %s as " PID_FMT ".", path, pid);
|
||
|
||
r = hashmap_put(pids, UINT_TO_PTR(pid), path);
|
||
if (r < 0) {
|
||
log_oom();
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
path = NULL;
|
||
}
|
||
|
||
/* Abort execution of this process after the
|
||
* timout. We simply rely on SIGALRM as default action
|
||
* terminating the process, and turn on alarm(). */
|
||
|
||
if (timeout != USEC_INFINITY)
|
||
alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
|
||
|
||
while (!hashmap_isempty(pids)) {
|
||
_cleanup_free_ char *path = NULL;
|
||
pid_t pid;
|
||
|
||
pid = PTR_TO_UINT(hashmap_first_key(pids));
|
||
assert(pid > 0);
|
||
|
||
path = hashmap_remove(pids, UINT_TO_PTR(pid));
|
||
assert(path);
|
||
|
||
wait_for_terminate_and_warn(path, pid);
|
||
}
|
||
|
||
_exit(EXIT_SUCCESS);
|
||
}
|
||
|
||
wait_for_terminate_and_warn(directory, executor_pid);
|
||
}
|
||
|
||
int kill_and_sigcont(pid_t pid, int sig) {
|
||
int r;
|
||
|
||
r = kill(pid, sig) < 0 ? -errno : 0;
|
||
|
||
if (r >= 0)
|
||
kill(pid, SIGCONT);
|
||
|
||
return r;
|
||
}
|
||
|
||
bool nulstr_contains(const char*nulstr, const char *needle) {
|
||
const char *i;
|
||
|
||
if (!nulstr)
|
||
return false;
|
||
|
||
NULSTR_FOREACH(i, nulstr)
|
||
if (streq(i, needle))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
bool plymouth_running(void) {
|
||
return access("/run/plymouth/pid", F_OK) >= 0;
|
||
}
|
||
|
||
char* strshorten(char *s, size_t l) {
|
||
assert(s);
|
||
|
||
if (l < strlen(s))
|
||
s[l] = 0;
|
||
|
||
return s;
|
||
}
|
||
|
||
static bool hostname_valid_char(char c) {
|
||
return
|
||
(c >= 'a' && c <= 'z') ||
|
||
(c >= 'A' && c <= 'Z') ||
|
||
(c >= '0' && c <= '9') ||
|
||
c == '-' ||
|
||
c == '_' ||
|
||
c == '.';
|
||
}
|
||
|
||
bool hostname_is_valid(const char *s) {
|
||
const char *p;
|
||
bool dot;
|
||
|
||
if (isempty(s))
|
||
return false;
|
||
|
||
for (p = s, dot = true; *p; p++) {
|
||
if (*p == '.') {
|
||
if (dot)
|
||
return false;
|
||
|
||
dot = true;
|
||
} else {
|
||
if (!hostname_valid_char(*p))
|
||
return false;
|
||
|
||
dot = false;
|
||
}
|
||
}
|
||
|
||
if (dot)
|
||
return false;
|
||
|
||
if (p-s > HOST_NAME_MAX)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
char* hostname_cleanup(char *s, bool lowercase) {
|
||
char *p, *d;
|
||
bool dot;
|
||
|
||
for (p = s, d = s, dot = true; *p; p++) {
|
||
if (*p == '.') {
|
||
if (dot)
|
||
continue;
|
||
|
||
*(d++) = '.';
|
||
dot = true;
|
||
} else if (hostname_valid_char(*p)) {
|
||
*(d++) = lowercase ? tolower(*p) : *p;
|
||
dot = false;
|
||
}
|
||
|
||
}
|
||
|
||
if (dot && d > s)
|
||
d[-1] = 0;
|
||
else
|
||
*d = 0;
|
||
|
||
strshorten(s, HOST_NAME_MAX);
|
||
|
||
return s;
|
||
}
|
||
|
||
bool machine_name_is_valid(const char *s) {
|
||
|
||
if (!hostname_is_valid(s))
|
||
return false;
|
||
|
||
/* Machine names should be useful hostnames, but also be
|
||
* useful in unit names, hence we enforce a stricter length
|
||
* limitation. */
|
||
|
||
if (strlen(s) > 64)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
int pipe_eof(int fd) {
|
||
struct pollfd pollfd = {
|
||
.fd = fd,
|
||
.events = POLLIN|POLLHUP,
|
||
};
|
||
|
||
int r;
|
||
|
||
r = poll(&pollfd, 1, 0);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
if (r == 0)
|
||
return 0;
|
||
|
||
return pollfd.revents & POLLHUP;
|
||
}
|
||
|
||
int fd_wait_for_event(int fd, int event, usec_t t) {
|
||
|
||
struct pollfd pollfd = {
|
||
.fd = fd,
|
||
.events = event,
|
||
};
|
||
|
||
struct timespec ts;
|
||
int r;
|
||
|
||
r = ppoll(&pollfd, 1, t == USEC_INFINITY ? NULL : timespec_store(&ts, t), NULL);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
if (r == 0)
|
||
return 0;
|
||
|
||
return pollfd.revents;
|
||
}
|
||
|
||
int fopen_temporary(const char *path, FILE **_f, char **_temp_path) {
|
||
FILE *f;
|
||
char *t;
|
||
int fd;
|
||
|
||
assert(path);
|
||
assert(_f);
|
||
assert(_temp_path);
|
||
|
||
t = tempfn_xxxxxx(path);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
fd = mkostemp_safe(t, O_WRONLY|O_CLOEXEC);
|
||
if (fd < 0) {
|
||
free(t);
|
||
return -errno;
|
||
}
|
||
|
||
f = fdopen(fd, "we");
|
||
if (!f) {
|
||
unlink(t);
|
||
free(t);
|
||
return -errno;
|
||
}
|
||
|
||
*_f = f;
|
||
*_temp_path = t;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int terminal_vhangup_fd(int fd) {
|
||
assert(fd >= 0);
|
||
|
||
if (ioctl(fd, TIOCVHANGUP) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int terminal_vhangup(const char *name) {
|
||
_cleanup_close_ int fd;
|
||
|
||
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
return terminal_vhangup_fd(fd);
|
||
}
|
||
|
||
int vt_disallocate(const char *name) {
|
||
int fd, r;
|
||
unsigned u;
|
||
|
||
/* Deallocate the VT if possible. If not possible
|
||
* (i.e. because it is the active one), at least clear it
|
||
* entirely (including the scrollback buffer) */
|
||
|
||
if (!startswith(name, "/dev/"))
|
||
return -EINVAL;
|
||
|
||
if (!tty_is_vc(name)) {
|
||
/* So this is not a VT. I guess we cannot deallocate
|
||
* it then. But let's at least clear the screen */
|
||
|
||
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
loop_write(fd,
|
||
"\033[r" /* clear scrolling region */
|
||
"\033[H" /* move home */
|
||
"\033[2J", /* clear screen */
|
||
10, false);
|
||
safe_close(fd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
if (!startswith(name, "/dev/tty"))
|
||
return -EINVAL;
|
||
|
||
r = safe_atou(name+8, &u);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (u <= 0)
|
||
return -EINVAL;
|
||
|
||
/* Try to deallocate */
|
||
fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
r = ioctl(fd, VT_DISALLOCATE, u);
|
||
safe_close(fd);
|
||
|
||
if (r >= 0)
|
||
return 0;
|
||
|
||
if (errno != EBUSY)
|
||
return -errno;
|
||
|
||
/* Couldn't deallocate, so let's clear it fully with
|
||
* scrollback */
|
||
fd = open_terminal(name, O_RDWR|O_NOCTTY|O_CLOEXEC);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
loop_write(fd,
|
||
"\033[r" /* clear scrolling region */
|
||
"\033[H" /* move home */
|
||
"\033[3J", /* clear screen including scrollback, requires Linux 2.6.40 */
|
||
10, false);
|
||
safe_close(fd);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int symlink_atomic(const char *from, const char *to) {
|
||
_cleanup_free_ char *t = NULL;
|
||
|
||
assert(from);
|
||
assert(to);
|
||
|
||
t = tempfn_random(to);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
if (symlink(from, t) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, to) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mknod_atomic(const char *path, mode_t mode, dev_t dev) {
|
||
_cleanup_free_ char *t = NULL;
|
||
|
||
assert(path);
|
||
|
||
t = tempfn_random(path);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
if (mknod(t, mode, dev) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, path) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mkfifo_atomic(const char *path, mode_t mode) {
|
||
_cleanup_free_ char *t = NULL;
|
||
|
||
assert(path);
|
||
|
||
t = tempfn_random(path);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
|
||
if (mkfifo(t, mode) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, path) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
bool display_is_local(const char *display) {
|
||
assert(display);
|
||
|
||
return
|
||
display[0] == ':' &&
|
||
display[1] >= '0' &&
|
||
display[1] <= '9';
|
||
}
|
||
|
||
int socket_from_display(const char *display, char **path) {
|
||
size_t k;
|
||
char *f, *c;
|
||
|
||
assert(display);
|
||
assert(path);
|
||
|
||
if (!display_is_local(display))
|
||
return -EINVAL;
|
||
|
||
k = strspn(display+1, "0123456789");
|
||
|
||
f = new(char, strlen("/tmp/.X11-unix/X") + k + 1);
|
||
if (!f)
|
||
return -ENOMEM;
|
||
|
||
c = stpcpy(f, "/tmp/.X11-unix/X");
|
||
memcpy(c, display+1, k);
|
||
c[k] = 0;
|
||
|
||
*path = f;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_user_creds(
|
||
const char **username,
|
||
uid_t *uid, gid_t *gid,
|
||
const char **home,
|
||
const char **shell) {
|
||
|
||
struct passwd *p;
|
||
uid_t u;
|
||
|
||
assert(username);
|
||
assert(*username);
|
||
|
||
/* We enforce some special rules for uid=0: in order to avoid
|
||
* NSS lookups for root we hardcode its data. */
|
||
|
||
if (streq(*username, "root") || streq(*username, "0")) {
|
||
*username = "root";
|
||
|
||
if (uid)
|
||
*uid = 0;
|
||
|
||
if (gid)
|
||
*gid = 0;
|
||
|
||
if (home)
|
||
*home = "/root";
|
||
|
||
if (shell)
|
||
*shell = "/bin/sh";
|
||
|
||
return 0;
|
||
}
|
||
|
||
if (parse_uid(*username, &u) >= 0) {
|
||
errno = 0;
|
||
p = getpwuid(u);
|
||
|
||
/* If there are multiple users with the same id, make
|
||
* sure to leave $USER to the configured value instead
|
||
* of the first occurrence in the database. However if
|
||
* the uid was configured by a numeric uid, then let's
|
||
* pick the real username from /etc/passwd. */
|
||
if (p)
|
||
*username = p->pw_name;
|
||
} else {
|
||
errno = 0;
|
||
p = getpwnam(*username);
|
||
}
|
||
|
||
if (!p)
|
||
return errno > 0 ? -errno : -ESRCH;
|
||
|
||
if (uid)
|
||
*uid = p->pw_uid;
|
||
|
||
if (gid)
|
||
*gid = p->pw_gid;
|
||
|
||
if (home)
|
||
*home = p->pw_dir;
|
||
|
||
if (shell)
|
||
*shell = p->pw_shell;
|
||
|
||
return 0;
|
||
}
|
||
|
||
char* uid_to_name(uid_t uid) {
|
||
struct passwd *p;
|
||
char *r;
|
||
|
||
if (uid == 0)
|
||
return strdup("root");
|
||
|
||
p = getpwuid(uid);
|
||
if (p)
|
||
return strdup(p->pw_name);
|
||
|
||
if (asprintf(&r, UID_FMT, uid) < 0)
|
||
return NULL;
|
||
|
||
return r;
|
||
}
|
||
|
||
char* gid_to_name(gid_t gid) {
|
||
struct group *p;
|
||
char *r;
|
||
|
||
if (gid == 0)
|
||
return strdup("root");
|
||
|
||
p = getgrgid(gid);
|
||
if (p)
|
||
return strdup(p->gr_name);
|
||
|
||
if (asprintf(&r, GID_FMT, gid) < 0)
|
||
return NULL;
|
||
|
||
return r;
|
||
}
|
||
|
||
int get_group_creds(const char **groupname, gid_t *gid) {
|
||
struct group *g;
|
||
gid_t id;
|
||
|
||
assert(groupname);
|
||
|
||
/* We enforce some special rules for gid=0: in order to avoid
|
||
* NSS lookups for root we hardcode its data. */
|
||
|
||
if (streq(*groupname, "root") || streq(*groupname, "0")) {
|
||
*groupname = "root";
|
||
|
||
if (gid)
|
||
*gid = 0;
|
||
|
||
return 0;
|
||
}
|
||
|
||
if (parse_gid(*groupname, &id) >= 0) {
|
||
errno = 0;
|
||
g = getgrgid(id);
|
||
|
||
if (g)
|
||
*groupname = g->gr_name;
|
||
} else {
|
||
errno = 0;
|
||
g = getgrnam(*groupname);
|
||
}
|
||
|
||
if (!g)
|
||
return errno > 0 ? -errno : -ESRCH;
|
||
|
||
if (gid)
|
||
*gid = g->gr_gid;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int in_gid(gid_t gid) {
|
||
gid_t *gids;
|
||
int ngroups_max, r, i;
|
||
|
||
if (getgid() == gid)
|
||
return 1;
|
||
|
||
if (getegid() == gid)
|
||
return 1;
|
||
|
||
ngroups_max = sysconf(_SC_NGROUPS_MAX);
|
||
assert(ngroups_max > 0);
|
||
|
||
gids = alloca(sizeof(gid_t) * ngroups_max);
|
||
|
||
r = getgroups(ngroups_max, gids);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
for (i = 0; i < r; i++)
|
||
if (gids[i] == gid)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int in_group(const char *name) {
|
||
int r;
|
||
gid_t gid;
|
||
|
||
r = get_group_creds(&name, &gid);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
return in_gid(gid);
|
||
}
|
||
|
||
int glob_exists(const char *path) {
|
||
_cleanup_globfree_ glob_t g = {};
|
||
int k;
|
||
|
||
assert(path);
|
||
|
||
errno = 0;
|
||
k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
|
||
|
||
if (k == GLOB_NOMATCH)
|
||
return 0;
|
||
else if (k == GLOB_NOSPACE)
|
||
return -ENOMEM;
|
||
else if (k == 0)
|
||
return !strv_isempty(g.gl_pathv);
|
||
else
|
||
return errno ? -errno : -EIO;
|
||
}
|
||
|
||
int glob_extend(char ***strv, const char *path) {
|
||
_cleanup_globfree_ glob_t g = {};
|
||
int k;
|
||
char **p;
|
||
|
||
errno = 0;
|
||
k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
|
||
|
||
if (k == GLOB_NOMATCH)
|
||
return -ENOENT;
|
||
else if (k == GLOB_NOSPACE)
|
||
return -ENOMEM;
|
||
else if (k != 0 || strv_isempty(g.gl_pathv))
|
||
return errno ? -errno : -EIO;
|
||
|
||
STRV_FOREACH(p, g.gl_pathv) {
|
||
k = strv_extend(strv, *p);
|
||
if (k < 0)
|
||
break;
|
||
}
|
||
|
||
return k;
|
||
}
|
||
|
||
int dirent_ensure_type(DIR *d, struct dirent *de) {
|
||
struct stat st;
|
||
|
||
assert(d);
|
||
assert(de);
|
||
|
||
if (de->d_type != DT_UNKNOWN)
|
||
return 0;
|
||
|
||
if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
|
||
return -errno;
|
||
|
||
de->d_type =
|
||
S_ISREG(st.st_mode) ? DT_REG :
|
||
S_ISDIR(st.st_mode) ? DT_DIR :
|
||
S_ISLNK(st.st_mode) ? DT_LNK :
|
||
S_ISFIFO(st.st_mode) ? DT_FIFO :
|
||
S_ISSOCK(st.st_mode) ? DT_SOCK :
|
||
S_ISCHR(st.st_mode) ? DT_CHR :
|
||
S_ISBLK(st.st_mode) ? DT_BLK :
|
||
DT_UNKNOWN;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_files_in_directory(const char *path, char ***list) {
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
size_t bufsize = 0, n = 0;
|
||
_cleanup_strv_free_ char **l = NULL;
|
||
|
||
assert(path);
|
||
|
||
/* Returns all files in a directory in *list, and the number
|
||
* of files as return value. If list is NULL returns only the
|
||
* number. */
|
||
|
||
d = opendir(path);
|
||
if (!d)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de && errno != 0)
|
||
return -errno;
|
||
if (!de)
|
||
break;
|
||
|
||
dirent_ensure_type(d, de);
|
||
|
||
if (!dirent_is_file(de))
|
||
continue;
|
||
|
||
if (list) {
|
||
/* one extra slot is needed for the terminating NULL */
|
||
if (!GREEDY_REALLOC(l, bufsize, n + 2))
|
||
return -ENOMEM;
|
||
|
||
l[n] = strdup(de->d_name);
|
||
if (!l[n])
|
||
return -ENOMEM;
|
||
|
||
l[++n] = NULL;
|
||
} else
|
||
n++;
|
||
}
|
||
|
||
if (list) {
|
||
*list = l;
|
||
l = NULL; /* avoid freeing */
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
char *strjoin(const char *x, ...) {
|
||
va_list ap;
|
||
size_t l;
|
||
char *r, *p;
|
||
|
||
va_start(ap, x);
|
||
|
||
if (x) {
|
||
l = strlen(x);
|
||
|
||
for (;;) {
|
||
const char *t;
|
||
size_t n;
|
||
|
||
t = va_arg(ap, const char *);
|
||
if (!t)
|
||
break;
|
||
|
||
n = strlen(t);
|
||
if (n > ((size_t) -1) - l) {
|
||
va_end(ap);
|
||
return NULL;
|
||
}
|
||
|
||
l += n;
|
||
}
|
||
} else
|
||
l = 0;
|
||
|
||
va_end(ap);
|
||
|
||
r = new(char, l+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
if (x) {
|
||
p = stpcpy(r, x);
|
||
|
||
va_start(ap, x);
|
||
|
||
for (;;) {
|
||
const char *t;
|
||
|
||
t = va_arg(ap, const char *);
|
||
if (!t)
|
||
break;
|
||
|
||
p = stpcpy(p, t);
|
||
}
|
||
|
||
va_end(ap);
|
||
} else
|
||
r[0] = 0;
|
||
|
||
return r;
|
||
}
|
||
|
||
bool is_main_thread(void) {
|
||
static thread_local int cached = 0;
|
||
|
||
if (_unlikely_(cached == 0))
|
||
cached = getpid() == gettid() ? 1 : -1;
|
||
|
||
return cached > 0;
|
||
}
|
||
|
||
int block_get_whole_disk(dev_t d, dev_t *ret) {
|
||
char *p, *s;
|
||
int r;
|
||
unsigned n, m;
|
||
|
||
assert(ret);
|
||
|
||
/* If it has a queue this is good enough for us */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r >= 0) {
|
||
*ret = d;
|
||
return 0;
|
||
}
|
||
|
||
/* If it is a partition find the originating device */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r < 0)
|
||
return -ENOENT;
|
||
|
||
/* Get parent dev_t */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = read_one_line_file(p, &s);
|
||
free(p);
|
||
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = sscanf(s, "%u:%u", &m, &n);
|
||
free(s);
|
||
|
||
if (r != 2)
|
||
return -EINVAL;
|
||
|
||
/* Only return this if it is really good enough for us. */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r >= 0) {
|
||
*ret = makedev(m, n);
|
||
return 0;
|
||
}
|
||
|
||
return -ENOENT;
|
||
}
|
||
|
||
int file_is_priv_sticky(const char *p) {
|
||
struct stat st;
|
||
|
||
assert(p);
|
||
|
||
if (lstat(p, &st) < 0)
|
||
return -errno;
|
||
|
||
return
|
||
(st.st_uid == 0 || st.st_uid == getuid()) &&
|
||
(st.st_mode & S_ISVTX);
|
||
}
|
||
|
||
static const char *const ioprio_class_table[] = {
|
||
[IOPRIO_CLASS_NONE] = "none",
|
||
[IOPRIO_CLASS_RT] = "realtime",
|
||
[IOPRIO_CLASS_BE] = "best-effort",
|
||
[IOPRIO_CLASS_IDLE] = "idle"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
|
||
|
||
static const char *const sigchld_code_table[] = {
|
||
[CLD_EXITED] = "exited",
|
||
[CLD_KILLED] = "killed",
|
||
[CLD_DUMPED] = "dumped",
|
||
[CLD_TRAPPED] = "trapped",
|
||
[CLD_STOPPED] = "stopped",
|
||
[CLD_CONTINUED] = "continued",
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
|
||
|
||
static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
|
||
[LOG_FAC(LOG_KERN)] = "kern",
|
||
[LOG_FAC(LOG_USER)] = "user",
|
||
[LOG_FAC(LOG_MAIL)] = "mail",
|
||
[LOG_FAC(LOG_DAEMON)] = "daemon",
|
||
[LOG_FAC(LOG_AUTH)] = "auth",
|
||
[LOG_FAC(LOG_SYSLOG)] = "syslog",
|
||
[LOG_FAC(LOG_LPR)] = "lpr",
|
||
[LOG_FAC(LOG_NEWS)] = "news",
|
||
[LOG_FAC(LOG_UUCP)] = "uucp",
|
||
[LOG_FAC(LOG_CRON)] = "cron",
|
||
[LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
|
||
[LOG_FAC(LOG_FTP)] = "ftp",
|
||
[LOG_FAC(LOG_LOCAL0)] = "local0",
|
||
[LOG_FAC(LOG_LOCAL1)] = "local1",
|
||
[LOG_FAC(LOG_LOCAL2)] = "local2",
|
||
[LOG_FAC(LOG_LOCAL3)] = "local3",
|
||
[LOG_FAC(LOG_LOCAL4)] = "local4",
|
||
[LOG_FAC(LOG_LOCAL5)] = "local5",
|
||
[LOG_FAC(LOG_LOCAL6)] = "local6",
|
||
[LOG_FAC(LOG_LOCAL7)] = "local7"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
|
||
|
||
static const char *const log_level_table[] = {
|
||
[LOG_EMERG] = "emerg",
|
||
[LOG_ALERT] = "alert",
|
||
[LOG_CRIT] = "crit",
|
||
[LOG_ERR] = "err",
|
||
[LOG_WARNING] = "warning",
|
||
[LOG_NOTICE] = "notice",
|
||
[LOG_INFO] = "info",
|
||
[LOG_DEBUG] = "debug"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
|
||
|
||
static const char* const sched_policy_table[] = {
|
||
[SCHED_OTHER] = "other",
|
||
[SCHED_BATCH] = "batch",
|
||
[SCHED_IDLE] = "idle",
|
||
[SCHED_FIFO] = "fifo",
|
||
[SCHED_RR] = "rr"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);
|
||
|
||
static const char* const rlimit_table[_RLIMIT_MAX] = {
|
||
[RLIMIT_CPU] = "LimitCPU",
|
||
[RLIMIT_FSIZE] = "LimitFSIZE",
|
||
[RLIMIT_DATA] = "LimitDATA",
|
||
[RLIMIT_STACK] = "LimitSTACK",
|
||
[RLIMIT_CORE] = "LimitCORE",
|
||
[RLIMIT_RSS] = "LimitRSS",
|
||
[RLIMIT_NOFILE] = "LimitNOFILE",
|
||
[RLIMIT_AS] = "LimitAS",
|
||
[RLIMIT_NPROC] = "LimitNPROC",
|
||
[RLIMIT_MEMLOCK] = "LimitMEMLOCK",
|
||
[RLIMIT_LOCKS] = "LimitLOCKS",
|
||
[RLIMIT_SIGPENDING] = "LimitSIGPENDING",
|
||
[RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
|
||
[RLIMIT_NICE] = "LimitNICE",
|
||
[RLIMIT_RTPRIO] = "LimitRTPRIO",
|
||
[RLIMIT_RTTIME] = "LimitRTTIME"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
|
||
|
||
static const char* const ip_tos_table[] = {
|
||
[IPTOS_LOWDELAY] = "low-delay",
|
||
[IPTOS_THROUGHPUT] = "throughput",
|
||
[IPTOS_RELIABILITY] = "reliability",
|
||
[IPTOS_LOWCOST] = "low-cost",
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff);
|
||
|
||
static const char *const __signal_table[] = {
|
||
[SIGHUP] = "HUP",
|
||
[SIGINT] = "INT",
|
||
[SIGQUIT] = "QUIT",
|
||
[SIGILL] = "ILL",
|
||
[SIGTRAP] = "TRAP",
|
||
[SIGABRT] = "ABRT",
|
||
[SIGBUS] = "BUS",
|
||
[SIGFPE] = "FPE",
|
||
[SIGKILL] = "KILL",
|
||
[SIGUSR1] = "USR1",
|
||
[SIGSEGV] = "SEGV",
|
||
[SIGUSR2] = "USR2",
|
||
[SIGPIPE] = "PIPE",
|
||
[SIGALRM] = "ALRM",
|
||
[SIGTERM] = "TERM",
|
||
#ifdef SIGSTKFLT
|
||
[SIGSTKFLT] = "STKFLT", /* Linux on SPARC doesn't know SIGSTKFLT */
|
||
#endif
|
||
[SIGCHLD] = "CHLD",
|
||
[SIGCONT] = "CONT",
|
||
[SIGSTOP] = "STOP",
|
||
[SIGTSTP] = "TSTP",
|
||
[SIGTTIN] = "TTIN",
|
||
[SIGTTOU] = "TTOU",
|
||
[SIGURG] = "URG",
|
||
[SIGXCPU] = "XCPU",
|
||
[SIGXFSZ] = "XFSZ",
|
||
[SIGVTALRM] = "VTALRM",
|
||
[SIGPROF] = "PROF",
|
||
[SIGWINCH] = "WINCH",
|
||
[SIGIO] = "IO",
|
||
[SIGPWR] = "PWR",
|
||
[SIGSYS] = "SYS"
|
||
};
|
||
|
||
DEFINE_PRIVATE_STRING_TABLE_LOOKUP(__signal, int);
|
||
|
||
const char *signal_to_string(int signo) {
|
||
static thread_local char buf[sizeof("RTMIN+")-1 + DECIMAL_STR_MAX(int) + 1];
|
||
const char *name;
|
||
|
||
name = __signal_to_string(signo);
|
||
if (name)
|
||
return name;
|
||
|
||
if (signo >= SIGRTMIN && signo <= SIGRTMAX)
|
||
snprintf(buf, sizeof(buf), "RTMIN+%d", signo - SIGRTMIN);
|
||
else
|
||
snprintf(buf, sizeof(buf), "%d", signo);
|
||
|
||
return buf;
|
||
}
|
||
|
||
int signal_from_string(const char *s) {
|
||
int signo;
|
||
int offset = 0;
|
||
unsigned u;
|
||
|
||
signo = __signal_from_string(s);
|
||
if (signo > 0)
|
||
return signo;
|
||
|
||
if (startswith(s, "RTMIN+")) {
|
||
s += 6;
|
||
offset = SIGRTMIN;
|
||
}
|
||
if (safe_atou(s, &u) >= 0) {
|
||
signo = (int) u + offset;
|
||
if (signo > 0 && signo < _NSIG)
|
||
return signo;
|
||
}
|
||
return -EINVAL;
|
||
}
|
||
|
||
bool kexec_loaded(void) {
|
||
bool loaded = false;
|
||
char *s;
|
||
|
||
if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
|
||
if (s[0] == '1')
|
||
loaded = true;
|
||
free(s);
|
||
}
|
||
return loaded;
|
||
}
|
||
|
||
int prot_from_flags(int flags) {
|
||
|
||
switch (flags & O_ACCMODE) {
|
||
|
||
case O_RDONLY:
|
||
return PROT_READ;
|
||
|
||
case O_WRONLY:
|
||
return PROT_WRITE;
|
||
|
||
case O_RDWR:
|
||
return PROT_READ|PROT_WRITE;
|
||
|
||
default:
|
||
return -EINVAL;
|
||
}
|
||
}
|
||
|
||
char *format_bytes(char *buf, size_t l, off_t t) {
|
||
unsigned i;
|
||
|
||
static const struct {
|
||
const char *suffix;
|
||
off_t factor;
|
||
} table[] = {
|
||
{ "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "T", 1024ULL*1024ULL*1024ULL*1024ULL },
|
||
{ "G", 1024ULL*1024ULL*1024ULL },
|
||
{ "M", 1024ULL*1024ULL },
|
||
{ "K", 1024ULL },
|
||
};
|
||
|
||
for (i = 0; i < ELEMENTSOF(table); i++) {
|
||
|
||
if (t >= table[i].factor) {
|
||
snprintf(buf, l,
|
||
"%llu.%llu%s",
|
||
(unsigned long long) (t / table[i].factor),
|
||
(unsigned long long) (((t*10ULL) / table[i].factor) % 10ULL),
|
||
table[i].suffix);
|
||
|
||
goto finish;
|
||
}
|
||
}
|
||
|
||
snprintf(buf, l, "%lluB", (unsigned long long) t);
|
||
|
||
finish:
|
||
buf[l-1] = 0;
|
||
return buf;
|
||
|
||
}
|
||
|
||
void* memdup(const void *p, size_t l) {
|
||
void *r;
|
||
|
||
assert(p);
|
||
|
||
r = malloc(l);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
memcpy(r, p, l);
|
||
return r;
|
||
}
|
||
|
||
int fd_inc_sndbuf(int fd, size_t n) {
|
||
int r, value;
|
||
socklen_t l = sizeof(value);
|
||
|
||
r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
|
||
if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
|
||
return 0;
|
||
|
||
/* If we have the privileges we will ignore the kernel limit. */
|
||
|
||
value = (int) n;
|
||
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0)
|
||
if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0)
|
||
return -errno;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int fd_inc_rcvbuf(int fd, size_t n) {
|
||
int r, value;
|
||
socklen_t l = sizeof(value);
|
||
|
||
r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l);
|
||
if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2)
|
||
return 0;
|
||
|
||
/* If we have the privileges we will ignore the kernel limit. */
|
||
|
||
value = (int) n;
|
||
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0)
|
||
if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0)
|
||
return -errno;
|
||
return 1;
|
||
}
|
||
|
||
int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
|
||
bool stdout_is_tty, stderr_is_tty;
|
||
pid_t parent_pid, agent_pid;
|
||
sigset_t ss, saved_ss;
|
||
unsigned n, i;
|
||
va_list ap;
|
||
char **l;
|
||
|
||
assert(pid);
|
||
assert(path);
|
||
|
||
/* Spawns a temporary TTY agent, making sure it goes away when
|
||
* we go away */
|
||
|
||
parent_pid = getpid();
|
||
|
||
/* First we temporarily block all signals, so that the new
|
||
* child has them blocked initially. This way, we can be sure
|
||
* that SIGTERMs are not lost we might send to the agent. */
|
||
assert_se(sigfillset(&ss) >= 0);
|
||
assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0);
|
||
|
||
agent_pid = fork();
|
||
if (agent_pid < 0) {
|
||
assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
|
||
return -errno;
|
||
}
|
||
|
||
if (agent_pid != 0) {
|
||
assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
|
||
*pid = agent_pid;
|
||
return 0;
|
||
}
|
||
|
||
/* In the child:
|
||
*
|
||
* Make sure the agent goes away when the parent dies */
|
||
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
|
||
_exit(EXIT_FAILURE);
|
||
|
||
/* Make sure we actually can kill the agent, if we need to, in
|
||
* case somebody invoked us from a shell script that trapped
|
||
* SIGTERM or so... */
|
||
reset_all_signal_handlers();
|
||
reset_signal_mask();
|
||
|
||
/* Check whether our parent died before we were able
|
||
* to set the death signal and unblock the signals */
|
||
if (getppid() != parent_pid)
|
||
_exit(EXIT_SUCCESS);
|
||
|
||
/* Don't leak fds to the agent */
|
||
close_all_fds(except, n_except);
|
||
|
||
stdout_is_tty = isatty(STDOUT_FILENO);
|
||
stderr_is_tty = isatty(STDERR_FILENO);
|
||
|
||
if (!stdout_is_tty || !stderr_is_tty) {
|
||
int fd;
|
||
|
||
/* Detach from stdout/stderr. and reopen
|
||
* /dev/tty for them. This is important to
|
||
* ensure that when systemctl is started via
|
||
* popen() or a similar call that expects to
|
||
* read EOF we actually do generate EOF and
|
||
* not delay this indefinitely by because we
|
||
* keep an unused copy of stdin around. */
|
||
fd = open("/dev/tty", O_WRONLY);
|
||
if (fd < 0) {
|
||
log_error("Failed to open /dev/tty: %m");
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
if (!stdout_is_tty)
|
||
dup2(fd, STDOUT_FILENO);
|
||
|
||
if (!stderr_is_tty)
|
||
dup2(fd, STDERR_FILENO);
|
||
|
||
if (fd > 2)
|
||
close(fd);
|
||
}
|
||
|
||
/* Count arguments */
|
||
va_start(ap, path);
|
||
for (n = 0; va_arg(ap, char*); n++)
|
||
;
|
||
va_end(ap);
|
||
|
||
/* Allocate strv */
|
||
l = alloca(sizeof(char *) * (n + 1));
|
||
|
||
/* Fill in arguments */
|
||
va_start(ap, path);
|
||
for (i = 0; i <= n; i++)
|
||
l[i] = va_arg(ap, char*);
|
||
va_end(ap);
|
||
|
||
execv(path, l);
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
int setrlimit_closest(int resource, const struct rlimit *rlim) {
|
||
struct rlimit highest, fixed;
|
||
|
||
assert(rlim);
|
||
|
||
if (setrlimit(resource, rlim) >= 0)
|
||
return 0;
|
||
|
||
if (errno != EPERM)
|
||
return -errno;
|
||
|
||
/* So we failed to set the desired setrlimit, then let's try
|
||
* to get as close as we can */
|
||
assert_se(getrlimit(resource, &highest) == 0);
|
||
|
||
fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
|
||
fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
|
||
|
||
if (setrlimit(resource, &fixed) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int getenv_for_pid(pid_t pid, const char *field, char **_value) {
|
||
_cleanup_fclose_ FILE *f = NULL;
|
||
char *value = NULL;
|
||
int r;
|
||
bool done = false;
|
||
size_t l;
|
||
const char *path;
|
||
|
||
assert(pid >= 0);
|
||
assert(field);
|
||
assert(_value);
|
||
|
||
path = procfs_file_alloca(pid, "environ");
|
||
|
||
f = fopen(path, "re");
|
||
if (!f)
|
||
return -errno;
|
||
|
||
l = strlen(field);
|
||
r = 0;
|
||
|
||
do {
|
||
char line[LINE_MAX];
|
||
unsigned i;
|
||
|
||
for (i = 0; i < sizeof(line)-1; i++) {
|
||
int c;
|
||
|
||
c = getc(f);
|
||
if (_unlikely_(c == EOF)) {
|
||
done = true;
|
||
break;
|
||
} else if (c == 0)
|
||
break;
|
||
|
||
line[i] = c;
|
||
}
|
||
line[i] = 0;
|
||
|
||
if (memcmp(line, field, l) == 0 && line[l] == '=') {
|
||
value = strdup(line + l + 1);
|
||
if (!value)
|
||
return -ENOMEM;
|
||
|
||
r = 1;
|
||
break;
|
||
}
|
||
|
||
} while (!done);
|
||
|
||
*_value = value;
|
||
return r;
|
||
}
|
||
|
||
bool is_valid_documentation_url(const char *url) {
|
||
assert(url);
|
||
|
||
if (startswith(url, "http://") && url[7])
|
||
return true;
|
||
|
||
if (startswith(url, "https://") && url[8])
|
||
return true;
|
||
|
||
if (startswith(url, "file:") && url[5])
|
||
return true;
|
||
|
||
if (startswith(url, "info:") && url[5])
|
||
return true;
|
||
|
||
if (startswith(url, "man:") && url[4])
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
bool in_initrd(void) {
|
||
static int saved = -1;
|
||
struct statfs s;
|
||
|
||
if (saved >= 0)
|
||
return saved;
|
||
|
||
/* We make two checks here:
|
||
*
|
||
* 1. the flag file /etc/initrd-release must exist
|
||
* 2. the root file system must be a memory file system
|
||
*
|
||
* The second check is extra paranoia, since misdetecting an
|
||
* initrd can have bad bad consequences due the initrd
|
||
* emptying when transititioning to the main systemd.
|
||
*/
|
||
|
||
saved = access("/etc/initrd-release", F_OK) >= 0 &&
|
||
statfs("/", &s) >= 0 &&
|
||
is_temporary_fs(&s);
|
||
|
||
return saved;
|
||
}
|
||
|
||
void warn_melody(void) {
|
||
_cleanup_close_ int fd = -1;
|
||
|
||
fd = open("/dev/console", O_WRONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0)
|
||
return;
|
||
|
||
/* Yeah, this is synchronous. Kinda sucks. But well... */
|
||
|
||
ioctl(fd, KIOCSOUND, (int)(1193180/440));
|
||
usleep(125*USEC_PER_MSEC);
|
||
|
||
ioctl(fd, KIOCSOUND, (int)(1193180/220));
|
||
usleep(125*USEC_PER_MSEC);
|
||
|
||
ioctl(fd, KIOCSOUND, (int)(1193180/220));
|
||
usleep(125*USEC_PER_MSEC);
|
||
|
||
ioctl(fd, KIOCSOUND, 0);
|
||
}
|
||
|
||
int make_console_stdio(void) {
|
||
int fd, r;
|
||
|
||
/* Make /dev/console the controlling terminal and stdin/stdout/stderr */
|
||
|
||
fd = acquire_terminal("/dev/console", false, true, true, USEC_INFINITY);
|
||
if (fd < 0) {
|
||
log_error("Failed to acquire terminal: %s", strerror(-fd));
|
||
return fd;
|
||
}
|
||
|
||
r = make_stdio(fd);
|
||
if (r < 0) {
|
||
log_error("Failed to duplicate terminal fd: %s", strerror(-r));
|
||
return r;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_home_dir(char **_h) {
|
||
struct passwd *p;
|
||
const char *e;
|
||
char *h;
|
||
uid_t u;
|
||
|
||
assert(_h);
|
||
|
||
/* Take the user specified one */
|
||
e = secure_getenv("HOME");
|
||
if (e && path_is_absolute(e)) {
|
||
h = strdup(e);
|
||
if (!h)
|
||
return -ENOMEM;
|
||
|
||
*_h = h;
|
||
return 0;
|
||
}
|
||
|
||
/* Hardcode home directory for root to avoid NSS */
|
||
u = getuid();
|
||
if (u == 0) {
|
||
h = strdup("/root");
|
||
if (!h)
|
||
return -ENOMEM;
|
||
|
||
*_h = h;
|
||
return 0;
|
||
}
|
||
|
||
/* Check the database... */
|
||
errno = 0;
|
||
p = getpwuid(u);
|
||
if (!p)
|
||
return errno > 0 ? -errno : -ESRCH;
|
||
|
||
if (!path_is_absolute(p->pw_dir))
|
||
return -EINVAL;
|
||
|
||
h = strdup(p->pw_dir);
|
||
if (!h)
|
||
return -ENOMEM;
|
||
|
||
*_h = h;
|
||
return 0;
|
||
}
|
||
|
||
int get_shell(char **_s) {
|
||
struct passwd *p;
|
||
const char *e;
|
||
char *s;
|
||
uid_t u;
|
||
|
||
assert(_s);
|
||
|
||
/* Take the user specified one */
|
||
e = getenv("SHELL");
|
||
if (e) {
|
||
s = strdup(e);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
*_s = s;
|
||
return 0;
|
||
}
|
||
|
||
/* Hardcode home directory for root to avoid NSS */
|
||
u = getuid();
|
||
if (u == 0) {
|
||
s = strdup("/bin/sh");
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
*_s = s;
|
||
return 0;
|
||
}
|
||
|
||
/* Check the database... */
|
||
errno = 0;
|
||
p = getpwuid(u);
|
||
if (!p)
|
||
return errno > 0 ? -errno : -ESRCH;
|
||
|
||
if (!path_is_absolute(p->pw_shell))
|
||
return -EINVAL;
|
||
|
||
s = strdup(p->pw_shell);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
*_s = s;
|
||
return 0;
|
||
}
|
||
|
||
bool filename_is_safe(const char *p) {
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
if (strchr(p, '/'))
|
||
return false;
|
||
|
||
if (streq(p, "."))
|
||
return false;
|
||
|
||
if (streq(p, ".."))
|
||
return false;
|
||
|
||
if (strlen(p) > FILENAME_MAX)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool string_is_safe(const char *p) {
|
||
const char *t;
|
||
|
||
if (!p)
|
||
return false;
|
||
|
||
for (t = p; *t; t++) {
|
||
if (*t > 0 && *t < ' ')
|
||
return false;
|
||
|
||
if (strchr("\\\"\'\0x7f", *t))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/**
|
||
* Check if a string contains control characters. If 'ok' is non-NULL
|
||
* it may be a string containing additional CCs to be considered OK.
|
||
*/
|
||
bool string_has_cc(const char *p, const char *ok) {
|
||
const char *t;
|
||
|
||
assert(p);
|
||
|
||
for (t = p; *t; t++) {
|
||
if (ok && strchr(ok, *t))
|
||
continue;
|
||
|
||
if (*t > 0 && *t < ' ')
|
||
return true;
|
||
|
||
if (*t == 127)
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
bool path_is_safe(const char *p) {
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
|
||
return false;
|
||
|
||
if (strlen(p) > PATH_MAX)
|
||
return false;
|
||
|
||
/* The following two checks are not really dangerous, but hey, they still are confusing */
|
||
if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./"))
|
||
return false;
|
||
|
||
if (strstr(p, "//"))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* hey glibc, APIs with callbacks without a user pointer are so useless */
|
||
void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
|
||
int (*compar) (const void *, const void *, void *), void *arg) {
|
||
size_t l, u, idx;
|
||
const void *p;
|
||
int comparison;
|
||
|
||
l = 0;
|
||
u = nmemb;
|
||
while (l < u) {
|
||
idx = (l + u) / 2;
|
||
p = (void *)(((const char *) base) + (idx * size));
|
||
comparison = compar(key, p, arg);
|
||
if (comparison < 0)
|
||
u = idx;
|
||
else if (comparison > 0)
|
||
l = idx + 1;
|
||
else
|
||
return (void *)p;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
bool is_locale_utf8(void) {
|
||
const char *set;
|
||
static int cached_answer = -1;
|
||
|
||
if (cached_answer >= 0)
|
||
goto out;
|
||
|
||
if (!setlocale(LC_ALL, "")) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
set = nl_langinfo(CODESET);
|
||
if (!set) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
if (streq(set, "UTF-8")) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
/* For LC_CTYPE=="C" return true, because CTYPE is effectly
|
||
* unset and everything can do to UTF-8 nowadays. */
|
||
set = setlocale(LC_CTYPE, NULL);
|
||
if (!set) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
/* Check result, but ignore the result if C was set
|
||
* explicitly. */
|
||
cached_answer =
|
||
streq(set, "C") &&
|
||
!getenv("LC_ALL") &&
|
||
!getenv("LC_CTYPE") &&
|
||
!getenv("LANG");
|
||
|
||
out:
|
||
return (bool) cached_answer;
|
||
}
|
||
|
||
const char *draw_special_char(DrawSpecialChar ch) {
|
||
static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = {
|
||
|
||
/* UTF-8 */ {
|
||
[DRAW_TREE_VERTICAL] = "\342\224\202 ", /* │ */
|
||
[DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */
|
||
[DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */
|
||
[DRAW_TREE_SPACE] = " ", /* */
|
||
[DRAW_TRIANGULAR_BULLET] = "\342\200\243", /* ‣ */
|
||
[DRAW_BLACK_CIRCLE] = "\342\227\217", /* ● */
|
||
[DRAW_ARROW] = "\342\206\222", /* → */
|
||
[DRAW_DASH] = "\342\200\223", /* – */
|
||
},
|
||
|
||
/* ASCII fallback */ {
|
||
[DRAW_TREE_VERTICAL] = "| ",
|
||
[DRAW_TREE_BRANCH] = "|-",
|
||
[DRAW_TREE_RIGHT] = "`-",
|
||
[DRAW_TREE_SPACE] = " ",
|
||
[DRAW_TRIANGULAR_BULLET] = ">",
|
||
[DRAW_BLACK_CIRCLE] = "*",
|
||
[DRAW_ARROW] = "->",
|
||
[DRAW_DASH] = "-",
|
||
}
|
||
};
|
||
|
||
return draw_table[!is_locale_utf8()][ch];
|
||
}
|
||
|
||
char *strreplace(const char *text, const char *old_string, const char *new_string) {
|
||
const char *f;
|
||
char *t, *r;
|
||
size_t l, old_len, new_len;
|
||
|
||
assert(text);
|
||
assert(old_string);
|
||
assert(new_string);
|
||
|
||
old_len = strlen(old_string);
|
||
new_len = strlen(new_string);
|
||
|
||
l = strlen(text);
|
||
r = new(char, l+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
f = text;
|
||
t = r;
|
||
while (*f) {
|
||
char *a;
|
||
size_t d, nl;
|
||
|
||
if (!startswith(f, old_string)) {
|
||
*(t++) = *(f++);
|
||
continue;
|
||
}
|
||
|
||
d = t - r;
|
||
nl = l - old_len + new_len;
|
||
a = realloc(r, nl + 1);
|
||
if (!a)
|
||
goto oom;
|
||
|
||
l = nl;
|
||
r = a;
|
||
t = r + d;
|
||
|
||
t = stpcpy(t, new_string);
|
||
f += old_len;
|
||
}
|
||
|
||
*t = 0;
|
||
return r;
|
||
|
||
oom:
|
||
free(r);
|
||
return NULL;
|
||
}
|
||
|
||
char *strip_tab_ansi(char **ibuf, size_t *_isz) {
|
||
const char *i, *begin = NULL;
|
||
enum {
|
||
STATE_OTHER,
|
||
STATE_ESCAPE,
|
||
STATE_BRACKET
|
||
} state = STATE_OTHER;
|
||
char *obuf = NULL;
|
||
size_t osz = 0, isz;
|
||
FILE *f;
|
||
|
||
assert(ibuf);
|
||
assert(*ibuf);
|
||
|
||
/* Strips ANSI color and replaces TABs by 8 spaces */
|
||
|
||
isz = _isz ? *_isz : strlen(*ibuf);
|
||
|
||
f = open_memstream(&obuf, &osz);
|
||
if (!f)
|
||
return NULL;
|
||
|
||
for (i = *ibuf; i < *ibuf + isz + 1; i++) {
|
||
|
||
switch (state) {
|
||
|
||
case STATE_OTHER:
|
||
if (i >= *ibuf + isz) /* EOT */
|
||
break;
|
||
else if (*i == '\x1B')
|
||
state = STATE_ESCAPE;
|
||
else if (*i == '\t')
|
||
fputs(" ", f);
|
||
else
|
||
fputc(*i, f);
|
||
break;
|
||
|
||
case STATE_ESCAPE:
|
||
if (i >= *ibuf + isz) { /* EOT */
|
||
fputc('\x1B', f);
|
||
break;
|
||
} else if (*i == '[') {
|
||
state = STATE_BRACKET;
|
||
begin = i + 1;
|
||
} else {
|
||
fputc('\x1B', f);
|
||
fputc(*i, f);
|
||
state = STATE_OTHER;
|
||
}
|
||
|
||
break;
|
||
|
||
case STATE_BRACKET:
|
||
|
||
if (i >= *ibuf + isz || /* EOT */
|
||
(!(*i >= '0' && *i <= '9') && *i != ';' && *i != 'm')) {
|
||
fputc('\x1B', f);
|
||
fputc('[', f);
|
||
state = STATE_OTHER;
|
||
i = begin-1;
|
||
} else if (*i == 'm')
|
||
state = STATE_OTHER;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (ferror(f)) {
|
||
fclose(f);
|
||
free(obuf);
|
||
return NULL;
|
||
}
|
||
|
||
fclose(f);
|
||
|
||
free(*ibuf);
|
||
*ibuf = obuf;
|
||
|
||
if (_isz)
|
||
*_isz = osz;
|
||
|
||
return obuf;
|
||
}
|
||
|
||
int on_ac_power(void) {
|
||
bool found_offline = false, found_online = false;
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
|
||
d = opendir("/sys/class/power_supply");
|
||
if (!d)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
_cleanup_close_ int fd = -1, device = -1;
|
||
char contents[6];
|
||
ssize_t n;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de && errno != 0)
|
||
return -errno;
|
||
|
||
if (!de)
|
||
break;
|
||
|
||
if (ignore_file(de->d_name))
|
||
continue;
|
||
|
||
device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (device < 0) {
|
||
if (errno == ENOENT || errno == ENOTDIR)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0) {
|
||
if (errno == ENOENT)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
n = read(fd, contents, sizeof(contents));
|
||
if (n < 0)
|
||
return -errno;
|
||
|
||
if (n != 6 || memcmp(contents, "Mains\n", 6))
|
||
continue;
|
||
|
||
safe_close(fd);
|
||
fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0) {
|
||
if (errno == ENOENT)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
n = read(fd, contents, sizeof(contents));
|
||
if (n < 0)
|
||
return -errno;
|
||
|
||
if (n != 2 || contents[1] != '\n')
|
||
return -EIO;
|
||
|
||
if (contents[0] == '1') {
|
||
found_online = true;
|
||
break;
|
||
} else if (contents[0] == '0')
|
||
found_offline = true;
|
||
else
|
||
return -EIO;
|
||
}
|
||
|
||
return found_online || !found_offline;
|
||
}
|
||
|
||
static int search_and_fopen_internal(const char *path, const char *mode, const char *root, char **search, FILE **_f) {
|
||
char **i;
|
||
|
||
assert(path);
|
||
assert(mode);
|
||
assert(_f);
|
||
|
||
if (!path_strv_resolve_uniq(search, root))
|
||
return -ENOMEM;
|
||
|
||
STRV_FOREACH(i, search) {
|
||
_cleanup_free_ char *p = NULL;
|
||
FILE *f;
|
||
|
||
if (root)
|
||
p = strjoin(root, *i, "/", path, NULL);
|
||
else
|
||
p = strjoin(*i, "/", path, NULL);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
f = fopen(p, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
if (errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
return -ENOENT;
|
||
}
|
||
|
||
int search_and_fopen(const char *path, const char *mode, const char *root, const char **search, FILE **_f) {
|
||
_cleanup_strv_free_ char **copy = NULL;
|
||
|
||
assert(path);
|
||
assert(mode);
|
||
assert(_f);
|
||
|
||
if (path_is_absolute(path)) {
|
||
FILE *f;
|
||
|
||
f = fopen(path, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
return -errno;
|
||
}
|
||
|
||
copy = strv_copy((char**) search);
|
||
if (!copy)
|
||
return -ENOMEM;
|
||
|
||
return search_and_fopen_internal(path, mode, root, copy, _f);
|
||
}
|
||
|
||
int search_and_fopen_nulstr(const char *path, const char *mode, const char *root, const char *search, FILE **_f) {
|
||
_cleanup_strv_free_ char **s = NULL;
|
||
|
||
if (path_is_absolute(path)) {
|
||
FILE *f;
|
||
|
||
f = fopen(path, mode);
|
||
if (f) {
|
||
*_f = f;
|
||
return 0;
|
||
}
|
||
|
||
return -errno;
|
||
}
|
||
|
||
s = strv_split_nulstr(search);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
return search_and_fopen_internal(path, mode, root, s, _f);
|
||
}
|
||
|
||
char *strextend(char **x, ...) {
|
||
va_list ap;
|
||
size_t f, l;
|
||
char *r, *p;
|
||
|
||
assert(x);
|
||
|
||
l = f = *x ? strlen(*x) : 0;
|
||
|
||
va_start(ap, x);
|
||
for (;;) {
|
||
const char *t;
|
||
size_t n;
|
||
|
||
t = va_arg(ap, const char *);
|
||
if (!t)
|
||
break;
|
||
|
||
n = strlen(t);
|
||
if (n > ((size_t) -1) - l) {
|
||
va_end(ap);
|
||
return NULL;
|
||
}
|
||
|
||
l += n;
|
||
}
|
||
va_end(ap);
|
||
|
||
r = realloc(*x, l+1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
p = r + f;
|
||
|
||
va_start(ap, x);
|
||
for (;;) {
|
||
const char *t;
|
||
|
||
t = va_arg(ap, const char *);
|
||
if (!t)
|
||
break;
|
||
|
||
p = stpcpy(p, t);
|
||
}
|
||
va_end(ap);
|
||
|
||
*p = 0;
|
||
*x = r;
|
||
|
||
return r + l;
|
||
}
|
||
|
||
char *strrep(const char *s, unsigned n) {
|
||
size_t l;
|
||
char *r, *p;
|
||
unsigned i;
|
||
|
||
assert(s);
|
||
|
||
l = strlen(s);
|
||
p = r = malloc(l * n + 1);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
for (i = 0; i < n; i++)
|
||
p = stpcpy(p, s);
|
||
|
||
*p = 0;
|
||
return r;
|
||
}
|
||
|
||
void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
|
||
size_t a, newalloc;
|
||
void *q;
|
||
|
||
assert(p);
|
||
assert(allocated);
|
||
|
||
if (*allocated >= need)
|
||
return *p;
|
||
|
||
newalloc = MAX(need * 2, 64u / size);
|
||
a = newalloc * size;
|
||
|
||
/* check for overflows */
|
||
if (a < size * need)
|
||
return NULL;
|
||
|
||
q = realloc(*p, a);
|
||
if (!q)
|
||
return NULL;
|
||
|
||
*p = q;
|
||
*allocated = newalloc;
|
||
return q;
|
||
}
|
||
|
||
void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
|
||
size_t prev;
|
||
uint8_t *q;
|
||
|
||
assert(p);
|
||
assert(allocated);
|
||
|
||
prev = *allocated;
|
||
|
||
q = greedy_realloc(p, allocated, need, size);
|
||
if (!q)
|
||
return NULL;
|
||
|
||
if (*allocated > prev)
|
||
memzero(q + prev * size, (*allocated - prev) * size);
|
||
|
||
return q;
|
||
}
|
||
|
||
bool id128_is_valid(const char *s) {
|
||
size_t i, l;
|
||
|
||
l = strlen(s);
|
||
if (l == 32) {
|
||
|
||
/* Simple formatted 128bit hex string */
|
||
|
||
for (i = 0; i < l; i++) {
|
||
char c = s[i];
|
||
|
||
if (!(c >= '0' && c <= '9') &&
|
||
!(c >= 'a' && c <= 'z') &&
|
||
!(c >= 'A' && c <= 'Z'))
|
||
return false;
|
||
}
|
||
|
||
} else if (l == 36) {
|
||
|
||
/* Formatted UUID */
|
||
|
||
for (i = 0; i < l; i++) {
|
||
char c = s[i];
|
||
|
||
if ((i == 8 || i == 13 || i == 18 || i == 23)) {
|
||
if (c != '-')
|
||
return false;
|
||
} else {
|
||
if (!(c >= '0' && c <= '9') &&
|
||
!(c >= 'a' && c <= 'z') &&
|
||
!(c >= 'A' && c <= 'Z'))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
} else
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
int split_pair(const char *s, const char *sep, char **l, char **r) {
|
||
char *x, *a, *b;
|
||
|
||
assert(s);
|
||
assert(sep);
|
||
assert(l);
|
||
assert(r);
|
||
|
||
if (isempty(sep))
|
||
return -EINVAL;
|
||
|
||
x = strstr(s, sep);
|
||
if (!x)
|
||
return -EINVAL;
|
||
|
||
a = strndup(s, x - s);
|
||
if (!a)
|
||
return -ENOMEM;
|
||
|
||
b = strdup(x + strlen(sep));
|
||
if (!b) {
|
||
free(a);
|
||
return -ENOMEM;
|
||
}
|
||
|
||
*l = a;
|
||
*r = b;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int shall_restore_state(void) {
|
||
_cleanup_free_ char *line = NULL;
|
||
const char *word, *state;
|
||
size_t l;
|
||
int r;
|
||
|
||
r = proc_cmdline(&line);
|
||
if (r < 0)
|
||
return r;
|
||
if (r == 0) /* Container ... */
|
||
return 1;
|
||
|
||
r = 1;
|
||
|
||
FOREACH_WORD_QUOTED(word, l, line, state) {
|
||
const char *e;
|
||
char n[l+1];
|
||
int k;
|
||
|
||
memcpy(n, word, l);
|
||
n[l] = 0;
|
||
|
||
e = startswith(n, "systemd.restore_state=");
|
||
if (!e)
|
||
continue;
|
||
|
||
k = parse_boolean(e);
|
||
if (k >= 0)
|
||
r = k;
|
||
}
|
||
|
||
return r;
|
||
}
|
||
|
||
int proc_cmdline(char **ret) {
|
||
int r;
|
||
|
||
if (detect_container(NULL) > 0) {
|
||
char *buf = NULL, *p;
|
||
size_t sz = 0;
|
||
|
||
r = read_full_file("/proc/1/cmdline", &buf, &sz);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
for (p = buf; p + 1 < buf + sz; p++)
|
||
if (*p == 0)
|
||
*p = ' ';
|
||
|
||
*p = 0;
|
||
*ret = buf;
|
||
return 1;
|
||
}
|
||
|
||
r = read_one_line_file("/proc/cmdline", ret);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
|
||
_cleanup_free_ char *line = NULL;
|
||
const char *w, *state;
|
||
size_t l;
|
||
int r;
|
||
|
||
assert(parse_item);
|
||
|
||
r = proc_cmdline(&line);
|
||
if (r < 0)
|
||
log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
|
||
if (r <= 0)
|
||
return 0;
|
||
|
||
FOREACH_WORD_QUOTED(w, l, line, state) {
|
||
char word[l+1], *value;
|
||
|
||
memcpy(word, w, l);
|
||
word[l] = 0;
|
||
|
||
/* Filter out arguments that are intended only for the
|
||
* initrd */
|
||
if (!in_initrd() && startswith(word, "rd."))
|
||
continue;
|
||
|
||
value = strchr(word, '=');
|
||
if (value)
|
||
*(value++) = 0;
|
||
|
||
r = parse_item(word, value);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int container_get_leader(const char *machine, pid_t *pid) {
|
||
_cleanup_free_ char *s = NULL, *class = NULL;
|
||
const char *p;
|
||
pid_t leader;
|
||
int r;
|
||
|
||
assert(machine);
|
||
assert(pid);
|
||
|
||
p = strappenda("/run/systemd/machines/", machine);
|
||
r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
|
||
if (r == -ENOENT)
|
||
return -EHOSTDOWN;
|
||
if (r < 0)
|
||
return r;
|
||
if (!s)
|
||
return -EIO;
|
||
|
||
if (!streq_ptr(class, "container"))
|
||
return -EIO;
|
||
|
||
r = parse_pid(s, &leader);
|
||
if (r < 0)
|
||
return r;
|
||
if (leader <= 1)
|
||
return -EIO;
|
||
|
||
*pid = leader;
|
||
return 0;
|
||
}
|
||
|
||
int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *root_fd) {
|
||
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1;
|
||
int rfd = -1;
|
||
|
||
assert(pid >= 0);
|
||
|
||
if (mntns_fd) {
|
||
const char *mntns;
|
||
|
||
mntns = procfs_file_alloca(pid, "ns/mnt");
|
||
mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (mntnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (pidns_fd) {
|
||
const char *pidns;
|
||
|
||
pidns = procfs_file_alloca(pid, "ns/pid");
|
||
pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (pidnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (netns_fd) {
|
||
const char *netns;
|
||
|
||
netns = procfs_file_alloca(pid, "ns/net");
|
||
netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (netnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (root_fd) {
|
||
const char *root;
|
||
|
||
root = procfs_file_alloca(pid, "root");
|
||
rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
|
||
if (rfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (pidns_fd)
|
||
*pidns_fd = pidnsfd;
|
||
|
||
if (mntns_fd)
|
||
*mntns_fd = mntnsfd;
|
||
|
||
if (netns_fd)
|
||
*netns_fd = netnsfd;
|
||
|
||
if (root_fd)
|
||
*root_fd = rfd;
|
||
|
||
pidnsfd = mntnsfd = netnsfd = -1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int root_fd) {
|
||
|
||
if (pidns_fd >= 0)
|
||
if (setns(pidns_fd, CLONE_NEWPID) < 0)
|
||
return -errno;
|
||
|
||
if (mntns_fd >= 0)
|
||
if (setns(mntns_fd, CLONE_NEWNS) < 0)
|
||
return -errno;
|
||
|
||
if (netns_fd >= 0)
|
||
if (setns(netns_fd, CLONE_NEWNET) < 0)
|
||
return -errno;
|
||
|
||
if (root_fd >= 0) {
|
||
if (fchdir(root_fd) < 0)
|
||
return -errno;
|
||
|
||
if (chroot(".") < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (setresgid(0, 0, 0) < 0)
|
||
return -errno;
|
||
|
||
if (setgroups(0, NULL) < 0)
|
||
return -errno;
|
||
|
||
if (setresuid(0, 0, 0) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
bool pid_is_unwaited(pid_t pid) {
|
||
/* Checks whether a PID is still valid at all, including a zombie */
|
||
|
||
if (pid <= 0)
|
||
return false;
|
||
|
||
if (kill(pid, 0) >= 0)
|
||
return true;
|
||
|
||
return errno != ESRCH;
|
||
}
|
||
|
||
bool pid_is_alive(pid_t pid) {
|
||
int r;
|
||
|
||
/* Checks whether a PID is still valid and not a zombie */
|
||
|
||
if (pid <= 0)
|
||
return false;
|
||
|
||
r = get_process_state(pid);
|
||
if (r == -ENOENT || r == 'Z')
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
int getpeercred(int fd, struct ucred *ucred) {
|
||
socklen_t n = sizeof(struct ucred);
|
||
struct ucred u;
|
||
int r;
|
||
|
||
assert(fd >= 0);
|
||
assert(ucred);
|
||
|
||
r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
if (n != sizeof(struct ucred))
|
||
return -EIO;
|
||
|
||
/* Check if the data is actually useful and not suppressed due
|
||
* to namespacing issues */
|
||
if (u.pid <= 0)
|
||
return -ENODATA;
|
||
|
||
*ucred = u;
|
||
return 0;
|
||
}
|
||
|
||
int getpeersec(int fd, char **ret) {
|
||
socklen_t n = 64;
|
||
char *s;
|
||
int r;
|
||
|
||
assert(fd >= 0);
|
||
assert(ret);
|
||
|
||
s = new0(char, n);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
|
||
if (r < 0) {
|
||
free(s);
|
||
|
||
if (errno != ERANGE)
|
||
return -errno;
|
||
|
||
s = new0(char, n);
|
||
if (!s)
|
||
return -ENOMEM;
|
||
|
||
r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
|
||
if (r < 0) {
|
||
free(s);
|
||
return -errno;
|
||
}
|
||
}
|
||
|
||
if (isempty(s)) {
|
||
free(s);
|
||
return -ENOTSUP;
|
||
}
|
||
|
||
*ret = s;
|
||
return 0;
|
||
}
|
||
|
||
/* This is much like like mkostemp() but is subject to umask(). */
|
||
int mkostemp_safe(char *pattern, int flags) {
|
||
_cleanup_umask_ mode_t u;
|
||
int fd;
|
||
|
||
assert(pattern);
|
||
|
||
u = umask(077);
|
||
|
||
fd = mkostemp(pattern, flags);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
return fd;
|
||
}
|
||
|
||
int open_tmpfile(const char *path, int flags) {
|
||
char *p;
|
||
int fd;
|
||
|
||
assert(path);
|
||
|
||
#ifdef O_TMPFILE
|
||
/* Try O_TMPFILE first, if it is supported */
|
||
fd = open(path, flags|O_TMPFILE, S_IRUSR|S_IWUSR);
|
||
if (fd >= 0)
|
||
return fd;
|
||
#endif
|
||
|
||
/* Fall back to unguessable name + unlinking */
|
||
p = strappenda(path, "/systemd-tmp-XXXXXX");
|
||
|
||
fd = mkostemp_safe(p, flags);
|
||
if (fd < 0)
|
||
return fd;
|
||
|
||
unlink(p);
|
||
return fd;
|
||
}
|
||
|
||
int fd_warn_permissions(const char *path, int fd) {
|
||
struct stat st;
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
if (st.st_mode & 0111)
|
||
log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path);
|
||
|
||
if (st.st_mode & 0002)
|
||
log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path);
|
||
|
||
if (getpid() == 1 && (st.st_mode & 0044) != 0044)
|
||
log_warning("Configuration file %s is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.", path);
|
||
|
||
return 0;
|
||
}
|
||
|
||
unsigned long personality_from_string(const char *p) {
|
||
|
||
/* Parse a personality specifier. We introduce our own
|
||
* identifiers that indicate specific ABIs, rather than just
|
||
* hints regarding the register size, since we want to keep
|
||
* things open for multiple locally supported ABIs for the
|
||
* same register size. We try to reuse the ABI identifiers
|
||
* used by libseccomp. */
|
||
|
||
#if defined(__x86_64__)
|
||
|
||
if (streq(p, "x86"))
|
||
return PER_LINUX32;
|
||
|
||
if (streq(p, "x86-64"))
|
||
return PER_LINUX;
|
||
|
||
#elif defined(__i386__)
|
||
|
||
if (streq(p, "x86"))
|
||
return PER_LINUX;
|
||
#endif
|
||
|
||
/* personality(7) documents that 0xffffffffUL is used for
|
||
* querying the current personality, hence let's use that here
|
||
* as error indicator. */
|
||
return 0xffffffffUL;
|
||
}
|
||
|
||
const char* personality_to_string(unsigned long p) {
|
||
|
||
#if defined(__x86_64__)
|
||
|
||
if (p == PER_LINUX32)
|
||
return "x86";
|
||
|
||
if (p == PER_LINUX)
|
||
return "x86-64";
|
||
|
||
#elif defined(__i386__)
|
||
|
||
if (p == PER_LINUX)
|
||
return "x86";
|
||
#endif
|
||
|
||
return NULL;
|
||
}
|
||
|
||
uint64_t physical_memory(void) {
|
||
long mem;
|
||
|
||
/* We return this as uint64_t in case we are running as 32bit
|
||
* process on a 64bit kernel with huge amounts of memory */
|
||
|
||
mem = sysconf(_SC_PHYS_PAGES);
|
||
assert(mem > 0);
|
||
|
||
return (uint64_t) mem * (uint64_t) page_size();
|
||
}
|
||
|
||
char* mount_test_option(const char *haystack, const char *needle) {
|
||
|
||
struct mntent me = {
|
||
.mnt_opts = (char*) haystack
|
||
};
|
||
|
||
assert(needle);
|
||
|
||
/* Like glibc's hasmntopt(), but works on a string, not a
|
||
* struct mntent */
|
||
|
||
if (!haystack)
|
||
return NULL;
|
||
|
||
return hasmntopt(&me, needle);
|
||
}
|
||
|
||
void hexdump(FILE *f, const void *p, size_t s) {
|
||
const uint8_t *b = p;
|
||
unsigned n = 0;
|
||
|
||
assert(s == 0 || b);
|
||
|
||
while (s > 0) {
|
||
size_t i;
|
||
|
||
fprintf(f, "%04x ", n);
|
||
|
||
for (i = 0; i < 16; i++) {
|
||
|
||
if (i >= s)
|
||
fputs(" ", f);
|
||
else
|
||
fprintf(f, "%02x ", b[i]);
|
||
|
||
if (i == 7)
|
||
fputc(' ', f);
|
||
}
|
||
|
||
fputc(' ', f);
|
||
|
||
for (i = 0; i < 16; i++) {
|
||
|
||
if (i >= s)
|
||
fputc(' ', f);
|
||
else
|
||
fputc(isprint(b[i]) ? (char) b[i] : '.', f);
|
||
}
|
||
|
||
fputc('\n', f);
|
||
|
||
if (s < 16)
|
||
break;
|
||
|
||
n += 16;
|
||
b += 16;
|
||
s -= 16;
|
||
}
|
||
}
|
||
|
||
int update_reboot_param_file(const char *param) {
|
||
int r = 0;
|
||
|
||
if (param) {
|
||
|
||
r = write_string_file(REBOOT_PARAM_FILE, param);
|
||
if (r < 0)
|
||
log_error("Failed to write reboot param to "
|
||
REBOOT_PARAM_FILE": %s", strerror(-r));
|
||
} else
|
||
unlink(REBOOT_PARAM_FILE);
|
||
|
||
return r;
|
||
}
|
||
|
||
int umount_recursive(const char *prefix, int flags) {
|
||
bool again;
|
||
int n = 0, r;
|
||
|
||
/* Try to umount everything recursively below a
|
||
* directory. Also, take care of stacked mounts, and keep
|
||
* unmounting them until they are gone. */
|
||
|
||
do {
|
||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||
|
||
again = false;
|
||
r = 0;
|
||
|
||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||
if (!proc_self_mountinfo)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
_cleanup_free_ char *path = NULL, *p = NULL;
|
||
int k;
|
||
|
||
k = fscanf(proc_self_mountinfo,
|
||
"%*s " /* (1) mount id */
|
||
"%*s " /* (2) parent id */
|
||
"%*s " /* (3) major:minor */
|
||
"%*s " /* (4) root */
|
||
"%ms " /* (5) mount point */
|
||
"%*s" /* (6) mount options */
|
||
"%*[^-]" /* (7) optional fields */
|
||
"- " /* (8) separator */
|
||
"%*s " /* (9) file system type */
|
||
"%*s" /* (10) mount source */
|
||
"%*s" /* (11) mount options 2 */
|
||
"%*[^\n]", /* some rubbish at the end */
|
||
&path);
|
||
if (k != 1) {
|
||
if (k == EOF)
|
||
break;
|
||
|
||
continue;
|
||
}
|
||
|
||
p = cunescape(path);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
if (!path_startswith(p, prefix))
|
||
continue;
|
||
|
||
if (umount2(p, flags) < 0) {
|
||
r = -errno;
|
||
continue;
|
||
}
|
||
|
||
again = true;
|
||
n++;
|
||
|
||
break;
|
||
}
|
||
|
||
} while (again);
|
||
|
||
return r ? r : n;
|
||
}
|
||
|
||
int bind_remount_recursive(const char *prefix, bool ro) {
|
||
_cleanup_set_free_free_ Set *done = NULL;
|
||
_cleanup_free_ char *cleaned = NULL;
|
||
int r;
|
||
|
||
/* Recursively remount a directory (and all its submounts)
|
||
* read-only or read-write. If the directory is already
|
||
* mounted, we reuse the mount and simply mark it
|
||
* MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write
|
||
* operation). If it isn't we first make it one. Afterwards we
|
||
* apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to all
|
||
* submounts we can access, too. When mounts are stacked on
|
||
* the same mount point we only care for each individual
|
||
* "top-level" mount on each point, as we cannot
|
||
* influence/access the underlying mounts anyway. We do not
|
||
* have any effect on future submounts that might get
|
||
* propagated, they migt be writable. This includes future
|
||
* submounts that have been triggered via autofs. */
|
||
|
||
cleaned = strdup(prefix);
|
||
if (!cleaned)
|
||
return -ENOMEM;
|
||
|
||
path_kill_slashes(cleaned);
|
||
|
||
done = set_new(&string_hash_ops);
|
||
if (!done)
|
||
return -ENOMEM;
|
||
|
||
for (;;) {
|
||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||
_cleanup_set_free_free_ Set *todo = NULL;
|
||
bool top_autofs = false;
|
||
char *x;
|
||
|
||
todo = set_new(&string_hash_ops);
|
||
if (!todo)
|
||
return -ENOMEM;
|
||
|
||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||
if (!proc_self_mountinfo)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
_cleanup_free_ char *path = NULL, *p = NULL, *type = NULL;
|
||
int k;
|
||
|
||
k = fscanf(proc_self_mountinfo,
|
||
"%*s " /* (1) mount id */
|
||
"%*s " /* (2) parent id */
|
||
"%*s " /* (3) major:minor */
|
||
"%*s " /* (4) root */
|
||
"%ms " /* (5) mount point */
|
||
"%*s" /* (6) mount options (superblock) */
|
||
"%*[^-]" /* (7) optional fields */
|
||
"- " /* (8) separator */
|
||
"%ms " /* (9) file system type */
|
||
"%*s" /* (10) mount source */
|
||
"%*s" /* (11) mount options (bind mount) */
|
||
"%*[^\n]", /* some rubbish at the end */
|
||
&path,
|
||
&type);
|
||
if (k != 2) {
|
||
if (k == EOF)
|
||
break;
|
||
|
||
continue;
|
||
}
|
||
|
||
p = cunescape(path);
|
||
if (!p)
|
||
return -ENOMEM;
|
||
|
||
/* Let's ignore autofs mounts. If they aren't
|
||
* triggered yet, we want to avoid triggering
|
||
* them, as we don't make any guarantees for
|
||
* future submounts anyway. If they are
|
||
* already triggered, then we will find
|
||
* another entry for this. */
|
||
if (streq(type, "autofs")) {
|
||
top_autofs = top_autofs || path_equal(cleaned, p);
|
||
continue;
|
||
}
|
||
|
||
if (path_startswith(p, cleaned) &&
|
||
!set_contains(done, p)) {
|
||
|
||
r = set_consume(todo, p);
|
||
p = NULL;
|
||
|
||
if (r == -EEXIST)
|
||
continue;
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
}
|
||
|
||
/* If we have no submounts to process anymore and if
|
||
* the root is either already done, or an autofs, we
|
||
* are done */
|
||
if (set_isempty(todo) &&
|
||
(top_autofs || set_contains(done, cleaned)))
|
||
return 0;
|
||
|
||
if (!set_contains(done, cleaned) &&
|
||
!set_contains(todo, cleaned)) {
|
||
/* The prefix directory itself is not yet a
|
||
* mount, make it one. */
|
||
if (mount(cleaned, cleaned, NULL, MS_BIND|MS_REC, NULL) < 0)
|
||
return -errno;
|
||
|
||
if (mount(NULL, prefix, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0)
|
||
return -errno;
|
||
|
||
x = strdup(cleaned);
|
||
if (!x)
|
||
return -ENOMEM;
|
||
|
||
r = set_consume(done, x);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
while ((x = set_steal_first(todo))) {
|
||
|
||
r = set_consume(done, x);
|
||
if (r == -EEXIST)
|
||
continue;
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (mount(NULL, x, NULL, MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) {
|
||
|
||
/* Deal with mount points that are
|
||
* obstructed by a later mount */
|
||
|
||
if (errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
int fflush_and_check(FILE *f) {
|
||
assert(f);
|
||
|
||
errno = 0;
|
||
fflush(f);
|
||
|
||
if (ferror(f))
|
||
return errno ? -errno : -EIO;
|
||
|
||
return 0;
|
||
}
|
||
|
||
char *tempfn_xxxxxx(const char *p) {
|
||
const char *fn;
|
||
char *t;
|
||
size_t k;
|
||
|
||
assert(p);
|
||
|
||
t = new(char, strlen(p) + 1 + 6 + 1);
|
||
if (!t)
|
||
return NULL;
|
||
|
||
fn = basename(p);
|
||
k = fn - p;
|
||
|
||
strcpy(stpcpy(stpcpy(mempcpy(t, p, k), "."), fn), "XXXXXX");
|
||
|
||
return t;
|
||
}
|
||
|
||
char *tempfn_random(const char *p) {
|
||
const char *fn;
|
||
char *t, *x;
|
||
uint64_t u;
|
||
size_t k;
|
||
unsigned i;
|
||
|
||
assert(p);
|
||
|
||
t = new(char, strlen(p) + 1 + 16 + 1);
|
||
if (!t)
|
||
return NULL;
|
||
|
||
fn = basename(p);
|
||
k = fn - p;
|
||
|
||
x = stpcpy(stpcpy(mempcpy(t, p, k), "."), fn);
|
||
|
||
u = random_u64();
|
||
for (i = 0; i < 16; i++) {
|
||
*(x++) = hexchar(u & 0xF);
|
||
u >>= 4;
|
||
}
|
||
|
||
*x = 0;
|
||
|
||
return t;
|
||
}
|
||
|
||
/* make sure the hostname is not "localhost" */
|
||
bool is_localhost(const char *hostname) {
|
||
assert(hostname);
|
||
|
||
/* This tries to identify local host and domain names
|
||
* described in RFC6761 plus the redhatism of .localdomain */
|
||
|
||
return streq(hostname, "localhost") ||
|
||
streq(hostname, "localhost.") ||
|
||
streq(hostname, "localdomain.") ||
|
||
streq(hostname, "localdomain") ||
|
||
endswith(hostname, ".localhost") ||
|
||
endswith(hostname, ".localhost.") ||
|
||
endswith(hostname, ".localdomain") ||
|
||
endswith(hostname, ".localdomain.");
|
||
}
|
||
|
||
int take_password_lock(const char *root) {
|
||
|
||
struct flock flock = {
|
||
.l_type = F_WRLCK,
|
||
.l_whence = SEEK_SET,
|
||
.l_start = 0,
|
||
.l_len = 0,
|
||
};
|
||
|
||
const char *path;
|
||
int fd, r;
|
||
|
||
/* This is roughly the same as lckpwdf(), but not as awful. We
|
||
* don't want to use alarm() and signals, hence we implement
|
||
* our own trivial version of this.
|
||
*
|
||
* Note that shadow-utils also takes per-database locks in
|
||
* addition to lckpwdf(). However, we don't given that they
|
||
* are redundant as they they invoke lckpwdf() first and keep
|
||
* it during everything they do. The per-database locks are
|
||
* awfully racy, and thus we just won't do them. */
|
||
|
||
if (root)
|
||
path = strappenda(root, "/etc/.pwd.lock");
|
||
else
|
||
path = "/etc/.pwd.lock";
|
||
|
||
fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
r = fcntl(fd, F_SETLKW, &flock);
|
||
if (r < 0) {
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
return fd;
|
||
}
|
||
|
||
int is_symlink(const char *path) {
|
||
struct stat info;
|
||
|
||
if (lstat(path, &info) < 0)
|
||
return -errno;
|
||
|
||
return !!S_ISLNK(info.st_mode);
|
||
}
|
||
|
||
int is_dir(const char* path, bool follow) {
|
||
struct stat st;
|
||
|
||
if (follow) {
|
||
if (stat(path, &st) < 0)
|
||
return -errno;
|
||
} else {
|
||
if (lstat(path, &st) < 0)
|
||
return -errno;
|
||
}
|
||
|
||
return !!S_ISDIR(st.st_mode);
|
||
}
|
||
|
||
int unquote_first_word(const char **p, char **ret) {
|
||
_cleanup_free_ char *s = NULL;
|
||
size_t allocated = 0, sz = 0;
|
||
|
||
enum {
|
||
START,
|
||
VALUE,
|
||
VALUE_ESCAPE,
|
||
SINGLE_QUOTE,
|
||
SINGLE_QUOTE_ESCAPE,
|
||
DOUBLE_QUOTE,
|
||
DOUBLE_QUOTE_ESCAPE,
|
||
SPACE,
|
||
} state = START;
|
||
|
||
assert(p);
|
||
assert(*p);
|
||
assert(ret);
|
||
|
||
/* Parses the first word of a string, and returns it in
|
||
* *ret. Removes all quotes in the process. When parsing fails
|
||
* (because of an uneven number of quotes or similar), leaves
|
||
* the pointer *p at the first invalid character. */
|
||
|
||
for (;;) {
|
||
char c = **p;
|
||
|
||
switch (state) {
|
||
|
||
case START:
|
||
if (c == 0)
|
||
goto finish;
|
||
else if (strchr(WHITESPACE, c))
|
||
break;
|
||
|
||
state = VALUE;
|
||
/* fallthrough */
|
||
|
||
case VALUE:
|
||
if (c == 0)
|
||
goto finish;
|
||
else if (c == '\'')
|
||
state = SINGLE_QUOTE;
|
||
else if (c == '\\')
|
||
state = VALUE_ESCAPE;
|
||
else if (c == '\"')
|
||
state = DOUBLE_QUOTE;
|
||
else if (strchr(WHITESPACE, c))
|
||
state = SPACE;
|
||
else {
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case VALUE_ESCAPE:
|
||
if (c == 0)
|
||
return -EINVAL;
|
||
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
state = VALUE;
|
||
|
||
break;
|
||
|
||
case SINGLE_QUOTE:
|
||
if (c == 0)
|
||
return -EINVAL;
|
||
else if (c == '\'')
|
||
state = VALUE;
|
||
else if (c == '\\')
|
||
state = SINGLE_QUOTE_ESCAPE;
|
||
else {
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case SINGLE_QUOTE_ESCAPE:
|
||
if (c == 0)
|
||
return -EINVAL;
|
||
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
state = SINGLE_QUOTE;
|
||
break;
|
||
|
||
case DOUBLE_QUOTE:
|
||
if (c == 0)
|
||
return -EINVAL;
|
||
else if (c == '\"')
|
||
state = VALUE;
|
||
else if (c == '\\')
|
||
state = DOUBLE_QUOTE_ESCAPE;
|
||
else {
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
}
|
||
|
||
break;
|
||
|
||
case DOUBLE_QUOTE_ESCAPE:
|
||
if (c == 0)
|
||
return -EINVAL;
|
||
|
||
if (!GREEDY_REALLOC(s, allocated, sz+2))
|
||
return -ENOMEM;
|
||
|
||
s[sz++] = c;
|
||
state = DOUBLE_QUOTE;
|
||
break;
|
||
|
||
case SPACE:
|
||
if (c == 0)
|
||
goto finish;
|
||
if (!strchr(WHITESPACE, c))
|
||
goto finish;
|
||
|
||
break;
|
||
}
|
||
|
||
(*p) ++;
|
||
}
|
||
|
||
finish:
|
||
if (!s) {
|
||
*ret = NULL;
|
||
return 0;
|
||
}
|
||
|
||
s[sz] = 0;
|
||
*ret = s;
|
||
s = NULL;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int unquote_many_words(const char **p, ...) {
|
||
va_list ap;
|
||
char **l;
|
||
int n = 0, i, c, r;
|
||
|
||
/* Parses a number of words from a string, stripping any
|
||
* quotes if necessary. */
|
||
|
||
assert(p);
|
||
|
||
/* Count how many words are expected */
|
||
va_start(ap, p);
|
||
for (;;) {
|
||
if (!va_arg(ap, char **))
|
||
break;
|
||
n++;
|
||
}
|
||
va_end(ap);
|
||
|
||
if (n <= 0)
|
||
return 0;
|
||
|
||
/* Read all words into a temporary array */
|
||
l = newa0(char*, n);
|
||
for (c = 0; c < n; c++) {
|
||
|
||
r = unquote_first_word(p, &l[c]);
|
||
if (r < 0) {
|
||
int j;
|
||
|
||
for (j = 0; j < c; j++)
|
||
free(l[j]);
|
||
|
||
return r;
|
||
}
|
||
|
||
if (r == 0)
|
||
break;
|
||
}
|
||
|
||
/* If we managed to parse all words, return them in the passed
|
||
* in parameters */
|
||
va_start(ap, p);
|
||
for (i = 0; i < n; i++) {
|
||
char **v;
|
||
|
||
v = va_arg(ap, char **);
|
||
assert(v);
|
||
|
||
*v = l[i];
|
||
}
|
||
va_end(ap);
|
||
|
||
return c;
|
||
}
|
||
|
||
int free_and_strdup(char **p, const char *s) {
|
||
char *t;
|
||
|
||
assert(p);
|
||
|
||
/* Replaces a string pointer with an strdup()ed new string,
|
||
* possibly freeing the old one. */
|
||
|
||
if (s) {
|
||
t = strdup(s);
|
||
if (!t)
|
||
return -ENOMEM;
|
||
} else
|
||
t = NULL;
|
||
|
||
free(*p);
|
||
*p = t;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int sethostname_idempotent(const char *s) {
|
||
int r;
|
||
char buf[HOST_NAME_MAX + 1] = {};
|
||
|
||
assert(s);
|
||
|
||
r = gethostname(buf, sizeof(buf));
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
if (streq(buf, s))
|
||
return 0;
|
||
|
||
r = sethostname(s, strlen(s));
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
return 1;
|
||
}
|